Extrasolar Visions II
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Extrasolar Visions II

Extrasolar Planets.
 
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 HATnet Results

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Edasich
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Number of posts : 2267
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PostSubject: Re: HATnet Results   HATnet Results - Page 4 Empty1st January 2013, 7:14 am

The new year starts very well with two more HATNet planets!

HAT-P-42b and HAT-P-43b. Two Inflated Transiting Hot Jupiters from the HATNet Survey

Quote :
First identified from the HATNet wide-field photometric survey, these candidate transiting planets were then followed-up with a variety of photometric observations. Determining the planetary nature of the objects and characterizing the parameters of the systems were mainly done with the SOPHIE spectrograph at the 1.93m telescope at OHP and the TRES spectrograph at the 1.5m telescope at FLWO. HAT-P-42b and HAT-P-43b are typical hot Jupiters on circular orbits around early-G/late-F main sequence host stars, with periods of 4.641876\pm0.000032 and 3.332688\pm0.000016 days, masses of 0.975\pm0.126 and 0.660\pm0.083 Mjup, and radii of 1.277\pm0.149 and 1.283+0.057-0.034 Rjup, respectively. These discoveries increase the sample of planets with measured mean densities, which is needed to constrain theories of planetary interiors and atmospheres. Moreover, their hosts are relatively bright (V < 13.5) facilitating further follow-up studies.


Happy New Year! santa
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tommi59
Jovian
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PostSubject: Re: HATnet Results   HATnet Results - Page 4 Empty28th January 2013, 3:03 pm

Paper about HAT-P-7 on sciencedaily confirmation planet c
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Lazarus
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PostSubject: Re: HATnet Results   HATnet Results - Page 4 Empty28th January 2013, 3:11 pm

tommi59 wrote:
Paper about HAT-P-7 on sciencedaily confirmation planet c
Looks like this has finally gotten a press release. Paper referenced is the same.
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Lazarus
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PostSubject: Re: HATnet Results   HATnet Results - Page 4 Empty29th January 2013, 1:56 am

An update on the HAT-P-17 two-planet system. The outer planet HAT-P-17c is less well constrained than previously thought.

The Stellar Obliquity and the Long-period planet in the HAT-P-17 Exoplanetary System
http://arxiv.org/abs/1301.6289
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tommi59
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PostSubject: Re: HATnet Results   HATnet Results - Page 4 Empty29th January 2013, 5:05 am

So we know really nothing .There could be 1 long period companion but also can be 2 or even 3 less massive planets as in case our solar system
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Sirius_Alpha
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PostSubject: Re: HATnet Results   HATnet Results - Page 4 Empty13th August 2013, 9:52 pm

HAT-P-44b, HAT-P-45b, and HAT-P-46b: Three Transiting Hot Jupiters in Possible Multi-Planet Systems
http://arxiv.org/abs/1308.2937

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Edasich
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PostSubject: Re: HATnet Results   HATnet Results - Page 4 Empty14th August 2013, 2:16 pm

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PostSubject: Re: HATnet Results   HATnet Results - Page 4 Empty21st January 2014, 9:25 pm


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Edasich
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PostSubject: Re: HATnet Results   HATnet Results - Page 4 Empty22nd January 2014, 4:52 am

I don't get this new "trend" to announce planets without following the numerical order (like KELT, Kepler...).  Suspect 

By the way a new hot Jupiter orbiting an early F type star, much hotter than Corot-11.  Smile
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PostSubject: Re: HATnet Results   HATnet Results - Page 4 Empty22nd January 2014, 5:26 am

Edasich wrote:
I don't get this new "trend" to announce planets without following the numerical order (like KELT, Kepler...).  Suspect 
It has to do with how easy it is to confirm a planet not necessarily being scaled to when the planet is discovered. If Sirius_Alpha 1b is discovered before Sirius_Alpha 2b, but 2b orbits a brighter star and is easier to confirm, you might see Sirius_Alpha 2b on arXiv before you see 1b, simply because it was easier to secure the fewer resources needed for its confirmation.

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PostSubject: Re: HATnet Results   HATnet Results - Page 4 Empty23rd January 2014, 4:21 am

Sirius_Alpha wrote:
Edasich wrote:
I don't get this new "trend" to announce planets without following the numerical order (like KELT, Kepler...).  Suspect 
It has to do with how easy it is to confirm a planet not necessarily being scaled to when the planet is discovered. If Sirius_Alpha 1b is discovered before Sirius_Alpha 2b, but 2b orbits a brighter star and is easier to confirm, you might see Sirius_Alpha 2b on arXiv before you see 1b, simply because it was easier to secure the fewer resources needed for its confirmation.

I see. That's got be the case.  Rolling Eyes 
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Edasich
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PostSubject: Re: HATnet Results   HATnet Results - Page 4 Empty18th April 2014, 3:35 am

Bouncing from HAT-P-49 b to HAT-P-54 b.

HAT-P-54b: A hot jupiter transiting a 0.64 Msun star in field 0 of the K2 mission

Quote :
We report the discovery of HAT-P-54b, a planet transiting a late K dwarf star in field 0 of the NASA K2 mission. We combine ground-based photometric light curves with radial velocity measurements to determine the physical parameters of the system. HAT-P-54b has a mass of 0.760 ± 0.032 MJ, a radius of 0.944 ± 0.028 RJ, and an orbital period of 3.7998 d. The star has V = 13.505 ± 0.060, a mass of 0.645 ± 0.020 M⊙, a radius of 0.617 ± 0.013 R⊙, an effective temperature of Teff = 4390 ± 50K, and a subsolar metallicity of [Fe/H] = -0.127 ± 0.080. HAT-P-54b has a radius that is smaller than 92% of the known transiting planets with masses greater than that of Saturn, while HAT-P-54 is one of the lowest-mass stars known to host a hot Jupiter. Follow-up high-precision photometric observations by the K2 mission promise to make this a well-studied planetary system.

P.S.

What's with 47, 48 and 50 to 53??  Suspect
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Edasich
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PostSubject: Re: HATnet Results   HATnet Results - Page 4 Empty16th March 2015, 4:39 am

Edasich wrote:
Bouncing from HAT-P-49 b to HAT-P-54 b.

HAT-P-54b: A hot jupiter transiting a 0.64 Msun star in field 0 of the K2 mission

Quote :
We report the discovery of HAT-P-54b, a planet transiting a late K dwarf star in field 0 of the NASA K2 mission. We combine ground-based photometric light curves with radial velocity measurements to determine the physical parameters of the system. HAT-P-54b has a mass of 0.760 ± 0.032 MJ, a radius of 0.944 ± 0.028 RJ, and an orbital period of 3.7998 d. The star has V = 13.505 ± 0.060, a mass of 0.645 ± 0.020 M⊙, a radius of 0.617 ± 0.013 R⊙, an effective temperature of Teff = 4390 ± 50K, and a subsolar metallicity of [Fe/H] = -0.127 ± 0.080. HAT-P-54b has a radius that is smaller than 92% of the known transiting planets with masses greater than that of Saturn, while HAT-P-54 is one of the lowest-mass stars known to host a hot Jupiter. Follow-up high-precision photometric observations by the K2 mission promise to make this a well-studied planetary system.

P.S.

What's with 47, 48 and 50 to 53??  Suspect

Quoting... myself here are some of the missing ones to the count Laughing

HAT-P-50b, HAT-P-51b, HAT-P-52b, and HAT-P-53b: Three Transiting Hot Jupiters and a Transiting Hot Saturn From the HATNet Survey

Quote :
We report the discovery and characterization of four transiting exoplanets by the HATNet survey. The planet HAT-P-50b has a mass of 1.35 M_J and a radius of 1.29 R_J, and orbits a bright (V = 11.8 mag) M = 1.27 M_sun, R = 1.70 R_sun star every P = 3.1220 days. The planet HAT-P-51b has a mass of 0.31 M_J and a radius of 1.29 R_J, and orbits a V = 13.4 mag, M = 0.98 M_sun, R = 1.04 R_sun star with a period of P = 4.2180 days. The planet HAT-P-52b has a mass of 0.82 M_J and a radius of 1.01 R_J, and orbits a V = 14.1 mag, M = 0.89 M_sun, R = 0.89 R_sun star with a period of P = 2.7536 days. The planet HAT-P-53b has a mass of 1.48 M_J and a radius of 1.32 R_J, and orbits a V = 13.7 mag, M = 1.09 M_sun, R = 1.21 R_sun star with a period of P = 1.9616 days. All four planets are consistent with having circular orbits and have masses and radii measured to better than 10% precision. The low stellar jitter and favorable R_P/R_star ratio for HAT-P-51 make it a promising target for measuring the Rossiter-McLaughlin effect for a Saturn-mass planet.
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Edasich
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PostSubject: Re: HATnet Results   HATnet Results - Page 4 Empty8th June 2015, 5:06 am

New entry: HAT-P-56 b.

An inflated massive Hot Jupiter transiting a bright F star followed up with K2.0 observations

Quote :
We report the discovery of HAT-P-56b by the HATNet survey, an inflated hot Jupiter transiting a bright F type star in Field 0 of NASA's K2 mission. We combine ground-based discovery and follow-up light curves with high precision photometry from K2, as well as ground-based radial velocities from TRES on the FLWO~1.5m telescope to determine the physical properties of this system. HAT-P-56b has a mass of Mp≈2.18MJ, radius of Rp≈1.47RJ, and transits its host star on a near-grazing orbit with a period of P≈ 2.7908 d. The radius of HAT-P-56b is among the largest known for a planet with Mp>2MJ. The host star has a V-band magnitude of 10.9, mass of 1.30 M⊙, and radius of 1.43 R⊙. The periodogram of the K2 light curve suggests the star is a γ Dor variable. HAT-P-56b is an example of a ground-based discovery of a transiting planet, where space-based observations greatly improve the confidence in the confirmation of its planetary nature, and also improve the accuracy of the planetary parameters.
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PostSubject: Re: HATnet Results   HATnet Results - Page 4 Empty8th June 2015, 10:10 am

Hey, this is one I remember studying at Planet Hunters, with only the K2 photometry. The star has a SIMBAD entry, a HD number and also a Hipparcos number. The faintness of the star makes the Hipparcos data pretty bad (the parallax is negative to 1 sigma, for example), but the proper motions seem alright.

It's good to see that the authors were able to detect the reflection effect. As far as I can tell, they don't actually give the implied albedo, though; given the amplitude of 21 ± 7 ppm and their calculated system parameters, I get a geometric albedo of 0.0767 ± 0.0295. This is similar to several other Hot Jupiters.

The authors also appear to assume that the large out-of-transit variability is due to pulsations. I suggest that they may be due to rotation; for the given values of the stellar radius and v sin i, a rotational period of 1.644 ± 0.03 days gives sin i = 0.912 ± 0.047, or a stellar inclination of 66 +8 -6 °. Alternatively, a rotational period of 1.744 ± 0.023 days gives sin i = 0.967 ± 0.045, so i = 75 +15 -8 °. The planetary inclination is 82.13 ± 0.18 °, so these rotational periods would indicate either slight star-planet misalignment or alignment, respectively. Observations of the Rossiter-McLaughlin effect would be beneficial here; given the high rotational velocity, it would be large and possibly detectable.
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PostSubject: Re: HATnet Results   HATnet Results - Page 4 Empty12th June 2015, 4:19 am

Number 55!

HAT-P-55b: A Hot Jupiter Transiting a Sun-like Star

Quote :
We report the discovery of a new transiting extrasolar planet, HAT-P-55b. The planet orbits a V = 13.207 +/- 0.039 sun-like star with a mass of 1.013 +/- 0.037 solar masses, a radius of 1.011 +/- 0.036 solar radii and a metallicity of -0.03 +/- 0.08. The planet itself is a typical hot Jupiter with a period of 3.5852467 +/- 0.0000064 days, a mass of 0.582 +/- 0.056 Jupiter masses and a radius of 1.182 +/- 0.055 Jupiter radii. This discovery adds to the increasing sample of transiting planets with measured bulk densities, which is needed to put constraints on models of planetary structure and formation theories.
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Edasich
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PostSubject: Re: HATnet Results   HATnet Results - Page 4 Empty30th October 2015, 4:41 am

A new hot Jupiter transiting an A-type star from HATNet Survey (host stars ha SWASP designation too, a WASP independent confirmation is not unlikely then)

HAT-P-57b: A Short-Period Giant Planet Transiting A Bright Rapidly Rotating A8V Star Confirmed Via Doppler Tomography

Quote :
We present the discovery of HAT-P-57b, a P = 2.4653 day transiting planet around a V = 10.465 +- 0.029 mag, Teff = 7500 +- 250 K main sequence A8V star with a projected rotation velocity of v sin i = 102.1 +- 1.3 km s^-1. We measure the radius of the planet to be R = 1.413 +- 0.054 R_J and, based on RV observations, place a 95% confidence upper limit on its mass of M < 1.85 M_J . Based on theoretical stellar evolution models, the host star has a mass and radius of 1.47 +- 0.12 M_sun, and 1.500 +- 0.050 R_sun, respectively. Spectroscopic observations made with Keck-I/HIRES during a partial transit event show the Doppler shadow of HAT-P-57b moving across the average spectral line profile of HAT-P- 57, confirming the object as a planetary system. We use these observations, together with analytic formulae that we derive for the line profile distortions, to determine the projected angle between the spin axis of HAT-P-57 and the orbital axis of HAT-P-57b. The data permit two possible solutions, with -16.7 deg < lambda < 3.3 deg or 27.6 deg < lambda < 57.4 deg at 95% confidence, and with relative probabilities for the two modes of 26% and 74%, respectively. Adaptive optics imaging with MMT/Clio2 reveals an object located 2.7" from HAT-P-57 consisting of two point sources separated in turn from each other by 0.22". The H and L -band magnitudes of the companion stars are consistent with their being physically associated with HAT-P-57, in which case they are stars of mass 0.61 +- 0.10 M_sun and 0.53 +- 0.08 M_sun. HAT-P-57 is the most rapidly rotating star, and only the fourth main sequence A star, known to host a transiting planet.
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PostSubject: Re: HATnet Results   HATnet Results - Page 4 Empty15th June 2016, 9:07 pm

HAT-P-47b AND HAT-P-48b: Two Low Density Sub-Saturn-Mass Transiting Planets on the Edge of the Period--Mass Desert
http://arxiv.org/abs/1606.04556

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PostSubject: Re: HATnet Results   HATnet Results - Page 4 Empty24th June 2016, 5:19 am

Stellar companions to HATNet and SuperWASP exoplanet hosts:

Friends of Hot Jupiters. IV. Stellar companions beyond 50 AU might facilitate giant planet formation, but most are unlikely to cause Kozai-Lidov migration
http://arxiv.org/abs/1606.07102v1
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PostSubject: Re: HATnet Results   HATnet Results - Page 4 Empty11th September 2016, 8:15 pm

HAT-P-65b and HAT-P-66b: Two Transiting Inflated Hot Jupiters and Observational Evidence for the Re-Inflation of Close-In Giant Planets
http://arxiv.org/abs/1609.02767

Quote :
We present the discovery of the transiting exoplanets HAT-P-65b and HAT-P-66b, with orbital periods of 2.6055 d and 2.9721 d, masses of 0.527±0.083 MJ and 0.783±0.057 MJ and inflated radii of 1.89±0.13 RJ and 1.59+0.16−0.10 RJ, respectively. They orbit moderately bright (V=13.145±0.029, and V=12.993±0.052) stars of mass 1.212±0.050 M⊙ and 1.255+0.107−0.054 M⊙. The stars are at the main sequence turnoff. While it is well known that the radii of close-in giant planets are correlated with their equilibrium temperatures, whether or not the radii of planets increase in time as their hosts evolve and become more luminous is an open question. Looking at the broader sample of well-characterized close-in transiting giant planets, we find that there is a statistically significant correlation between planetary radii and the fractional ages of their host stars, with a false alarm probability of only 0.0041%. We find that the correlation between the radii of planets and the fractional ages of their hosts is fully explained by the known correlation between planetary radii and their present day equilibrium temperatures, however if the zero-age main sequence equilibrium temperature is used in place of the present day equilibrium temperature then a correlation with age must also be included to explain the planetary radii. This suggests that, after contracting during the pre-main-sequence, close-in giant planets are re-inflated over time due to the increasing level of irradiation received from their host stars. Prior theoretical work indicates that such a dynamic response to irradiation requires a significant fraction of the incident energy to be deposited deep within the planetary interiors.

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PostSubject: Re: HATnet Results   HATnet Results - Page 4 Empty1st February 2017, 9:41 pm

That's a big one..

HAT-P-67b: An Extremely Low Density Saturn Transiting an F-Subgiant Confirmed via Doppler Tomography
https://arxiv.org/abs/1702.00106

Quote :
We report the discovery of HAT-P-67b, a hot-Saturn transiting a rapidly rotating F-subgiant. HAT-P-67b has a radius of Rp = 2.085 -0.071/+0.096 RJ, orbiting a M* = 1.642 -0.072/+0.155 Msun, R* = 2.546 -0.084/+0.099 Rsun host star in a ~4.81-day period orbit. We place an upper limit on the mass of the planet via radial velocity measurements to be Mp < 0.59 MJ, and lower limit of > 0.056 MJ by limitations on Roche lobe overflow. Despite being a subgiant, the host star still exhibits relatively rapid rotation, with a projected rotational velocity of v sin I* = 35.8 +/- 1.1 km/s, making it difficult to precisely determine the mass of the planet using radial velocities. We validated HAT-P-67b via two Doppler tomographic detections of the planetary transit, which eliminated potential eclipsing binary blend scenarios. The Doppler tomographic observations also confirmed that HAT-P-67b has an orbit that is aligned, in projection, with the spin of its host star. Due to the large radius and low mass of HAT-P-67b, it is amongst the lowest density gas giants known.

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PostSubject: Re: HATnet Results   HATnet Results - Page 4 Empty3rd June 2019, 10:14 pm

Two new HATNet hot Jupiters around A stars, and the first glimpse at the occurrence rate of hot Jupiters from TESS
https://arxiv.org/abs/1906.00462

Quote :
Wide field surveys for transiting planets are well suited to searching diverse stellar populations, enabling a better understanding of the link between the properties of planets and their parent stars. We report the discovery of HAT-P-69 b (TOI 625.01) and HAT-P-70 b (TOI 624.01), two new hot Jupiters around A stars from the HATNet survey which have also been observed by the Transiting Exoplanet Survey Satellite (TESS). HAT-P-69 b has a mass of 3.73 (+0.61/-0.59) Mjup and a radius of 1.626 (+0.032/-0.025) Rjup, and is in a prograde 4.79-day orbit around a star of mass 1.698+/-0.025 Msun and radius 1.854 (+0.043/-0.022) Rsun. HAT-P-70 b has a radius of 1.87 (+0.15/-0.10) Rjup and a mass constraint of <6.78 (3sigma) Mjup, and is in a retrograde 2.74-day orbit around a star of mass 1.890 (+0.010/-0.013) Msun and radius 1.858 (+0.119/-0.091) Rsun. We use the confirmation of these planets around relatively massive stars as an opportunity to explore the occurrence rate of hot Jupiters as a function of stellar mass. We define a sample of 47,126 main-sequence stars brighter than Tmag=10 that yields 31 giant planet candidates, including 18 confirmed planets, 3 candidates, and 10 false positives. We find a net hot Jupiter occurrence rate of 0.45+/-0.10% within this sample, consistent with the rate measured by Kepler for FGK stars. When divided into stellar mass bins, we find the occurrence rate to be 0.71+/-0.31% G stars, 0.43+/-0.15% for F stars, and 0.32+/-0.12% for A stars. Thus, at this point, we cannot discern any statistically significant trend in the occurrence of hot Jupiters with stellar mass.

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PostSubject: Re: HATnet Results   HATnet Results - Page 4 Empty13th July 2020, 9:59 pm

HAT-P-58b -- HAT-P-64b: Seven Planets Transiting Bright Stars
https://arxiv.org/abs/2007.05528

Quote :
We report the discovery and characterization of 7 transiting exoplanets from the HATNet survey. The planets, which are hot Jupiters and Saturns transiting bright sun-like stars, include: HAT-P-58b (with mass Mp = 0.37 MJ, radius Rp = 1.33 RJ, and orbital period P = 4.0138 days), HAT-P-59b (Mp = 1.54 MJ, Rp = 1.12 RJ, P = 4.1420 days), HAT-P-60b (Mp = 0.57 MJ, Rp = 1.63 RJ, P = 4.7948 days), HAT-P-61b (Mp = 1.06 MJ, Rp = 0.90 RJ, P = 1.9023 days), HAT-P-62b (Mp = 0.76 MJ, Rp = 1.07 RJ, P = 2.6453 days), HAT-P-63b (Mp = 0.61 MJ, Rp = 1.12 RJ, P = 3.3777 days), and HAT-P-64b (Mp = 0.58 MJ, Rp = 1.70 RJ, P = 4.0072 days). The typical errors on these quantities are 0.06 MJ, 0.03 RJ, and 0.2seconds, respectively. We also provide accurate stellar parameters for each of the hosts stars. With V = 9.710+/-0.050mag, HAT-P-60 is an especially bright transiting planet host, and an excellent target for additional follow-up observations. With Rp = 1.703+/-0.070 RJ, HAT-P-64b is a highly inflated hot Jupiter around a star nearing the end of its main-sequence lifetime, and is among the largest known planets. Five of the seven systems have long-cadence observations by TESS which are included in the analysis. Of particular note is HAT-P-59 (TOI-1826.01) which is within the Northern continuous viewing zone of the TESS mission, and HAT-P-60, which is the TESS candidate TOI-1580.01.

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PostSubject: Re: HATnet Results   HATnet Results - Page 4 Empty1st November 2020, 10:17 pm

HAT-P-68b: A Transiting Hot Jupiter Around a K5 Dwarf Star
https://arxiv.org/abs/2010.16026

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PostSubject: Re: HATnet Results   HATnet Results - Page 4 Empty29th June 2021, 4:10 pm

A possible second (non-transiting), nearly equal-mass planet in HAT-P-12 system from TTV.

Non-Sinusoidal Transit Timing Variations for the Exoplanet HAT-P-12b

Quote :
Considering the importance of investigating the transit timing variations (TTVs) of transiting exoplanets, we present a follow-up study of HAT-P-12b. We include six new light curves observed between 2011 and 2015 from three different observatories, in association with 25 light curves taken from the published literature. The sample of the data used, thus covers a time span of about 10.2 years with a large coverage of epochs (1160) for the transiting events of the exoplanet HAT-P-12b. The light curves are used to determine the orbital parameters and conduct an investigation of possible transit timing variations. The new linear ephemeris shows a large value of reduced chi-square = 7.93, and the sinusoidal fitting using the prominent frequency coming from a periodogram shows a reduced chi-square around 4. Based on these values and the corresponding O-C diagrams, we suspect the presence of a possible non-sinusoidal TTV in this planetary system. Finally, we find that a scenario with an additional non-transiting exoplanet could explain this TTV with an even smaller reduced chi-square value of around 2.
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