HATnet Results

First Evidence of a Retrograde Orbit of Transiting Exoplanet HAT-P-7b
http://arxiv.org/abs/0908.1673

Amusing change of title between revisions in this paper about HAT-P-7b...

v1
v2

guess it was pointed out that the third body may not necessarily be a planet...

Greg Laughlin's put up another article on the systemic blog about the HAT-P-13 system, in particularly highlighting this paper which indicates complications for the determination of the internal structure of the transiting planet if the system is misaligned.

Interestingly enough it seems the observed parameters constrain the mutual inclination: the system is either coplanar (prograde or retrograde), or the mutual inclination between the planetary orbits is around 45-50° or 130-135°.

Hopefully any transit timing variations around the periastron of planet c (or somewhat less likely, an actual transit of planet c) should help give an idea of the degree of coplanarity.

It is worth pointing out that a transit by c would not confirm coplanar orbits, but would certainly constrain it. If c does transit, then we won't know if they are co-planar or not until the Rossiter-McLaughlin effect of both b and c are measured.

It's likely that if both transit, their transit chords across the stellar disk will be in different stellar latitudes, giving us a peak into the differential rotation behavior of HAT-P-13's surface.

Another one with an unusually large eccentricity
I wish there was a way of directly measuring the tidal dissipation value for systems like this.

http://oklo.org/2010/03/17/inside-information/

Quote :

HAT-P-13c could easily wind up being 2010’s version of HD 80606b — a long-shot transit candidate that pans out to enable extraordinary follow-up characterization, while simultaneously allowing small-telescope ground-based observers to stunt on the transit-hunting space missions.

Quote :

We report the discovery of HAT-P-16b, a transiting extrasolar planet orbiting the V = 10.8 mag F8
dwarf GSC 2792-01700, with a period P = 2.775960±0.000003 d, transit epoch Tc = 2455027.59293± 0.00031 (BJD? ? ?), and transit duration 0.1276±0.0013d. The host star has a mass of 1.22±0.04M,
radius of 1.24±0.05R, effective temperature 6158±80K, and metallicity [Fe/H] = +0.17±0.08. The
planetary companion has a mass of 4.193 ± 0.094MJ, and radius of 1.289 ± 0.066RJ yielding a mean
density of 2.42±0.35 g cm−3. Comparing these observed characteristics with recent theoretical models,
we find that HAT-P-16b is consistent with a 1 Gyr H/He-dominated gas giant planet. HAT-P-16b
resides in a sparsely populated region of the mass–radius diagram and has a non-zero eccentricity of
e = 0.036 with a significance of 10.http://arxiv.org/PS_cache/arxiv/pdf/1005/1005.2009v1.pdf

Awaiting for HAT-P-15 b, cheers to 16 b. Similar to Tau Bootis b, someway, and way much larger.

I think it is associated with the recent announcement SuperWASP. Surely these two competing groups of found in transit hot Jupiters in the fields HATnet and now trying to publish a discovery before the others.

An example already
http://exoplanet.eu/star.php?st=WASP-11/HAT-P-10

HAT-P-15b: A 10.9-day Extrasolar Planet Transiting a Solar-type Star
http://arxiv.org/abs/1005.5300

Abstract wrote:

We report the discovery of HAT-P-15b, a transiting extrasolar planet in the `period valley', a relatively sparsely-populated period regime of the known extrasolar planets. The host star, GSC 2883-01687, is a G5 dwarf with V=12.16. It has a mass of 1.01+/-0.04 M(Sun), radius of 1.08+/-0.04 R(Sun), effective temperature 5568+/-90 K, and metallicity [Fe/H] = +0.22+/-0.08. The planetary companion orbits the star with a period 10.863502+/-0.000027 days, transit epoch Tc = 2454638.56019+/-0.00048 (BJD), and transit duration 0.2285+/-0.0015 days. It has a mass of 1.946+/-0.066 M(Jup), and radius of 1.072+/-0.043 R(Jup) yielding a mean density of 1.96+/-0.22 g/cm3. At an age of 6.8+/-2.1 Gyr, the planet is H/He-dominated and theoretical models require about 2% (10 M(Earth)) worth of heavy elements to reproduce its measured radius. With an estimated equilibrium temperature of 820 K during transit, and 1000 K at occultation, HAT-P-15b is a potential candidate to study moderately cool planetary atmospheres by transmission and occultation spectroscopy.

At last it has come. A "long period" transiting planet too.

http://nexsci.caltech.edu/workshop/2010/speaker_talks/GasparBakos.pdf

Quote :

HATNet has found ~1200 transiting planet candidates About 1 in 20 candidates survives. These survivors reach Keck or FIES/NOT: the peak of the follow-up pyramid.

Is there a way to get to that page through the NExScl site?

Sirius_Alpha wrote:

Is there a way to get to that page through the NExScl site?

The source of this presentation, new conference
http://nexsci.caltech.edu/workshop/2010/agenda.shtml

Okay, just making sure. Thanks.

HAT-P-18b and HAT-P-19b: Two Low-Density Saturn-Mass Planets Transiting Metal-Rich K Stars
http://arxiv.org/abs/1007.4850

Abstract wrote:

We report the discovery of two new transiting extrasolar planets. HAT-P-18b orbits the V=12.759 K2 dwarf star GSC 2594-00646, with a period P=5.508023+-0.000006 d, transit epoch Tc=2454715.02174+-0.00020 (BJD), and transit duration 0.1131+-0.0009 d. The host star has a mass of 0.77+-0.03 Msun, radius of 0.75+-0.04 Rsun, effective temperature 4803+-80 K, and metallicity [Fe/H]=+0.10+-0.08. The planetary companion has a mass of 0.197+-0.013 Mjup, and radius of 0.995+-0.052 Rjup yielding a mean density of 0.25+-0.04 g cm-3. HAT-P-19b orbits the V=12.901 K1 dwarf star GSC 2283-00589, with a period P=4.008778+-0.000006 d, transit epoch Tc=2455091.53417+-0.00034 (BJD), and transit duration 0.1182+-0.0014 d. The host star has a mass of 0.84+-0.04 Msun, radius of 0.82+-0.05 Rsun, effective temperature 4990+-130 K, and metallicity [Fe/H]=+0.23+-0.08. The planetary companion has a mass of 0.292+-0.018 Mjup, and radius of 1.132+-0.072 Rjup yielding a mean density of 0.25+-0.04 g cm-3. The radial velocity residuals for HAT-P-19 exhibit a linear trend in time, which indicates the presence of a third body in the system. Comparing these observations with theoretical models, we find that HAT-P-18b and HAT-P-19b are each consistent with a hydrogen-helium dominated gas giant planet with negligible core mass. HAT-P-18b and HAT-P-19b join HAT-P-12b and WASP-21b in an emerging group of low-density Saturn-mass planets, with negligible inferred core masses. However, unlike HAT-P-12b and WASP-21b, both HAT-P-18b and HAT-P-19b orbit stars with super-solar metallicity. This calls into question the heretofore suggestive correlation between the inferred core mass and host star metallicity for Saturn-mass planets.

Shouldn't this be merged with HATNet results??

Surely these are the most unusual transiting planets so far detected. One fifth of Jupiter mass but similar radius.

Edasich wrote:

Shouldn't this be merged with HATNet results??

Ahh yeah. Fixed. Thanks.

However we have still missing HAT-P-17. These HATNet planets pop up in not so orderly way

HATnet explodes in a fury of planet discoveries as transiting planets take the lead in the 2010 yearly total discoveries.

HAT-P-20b--HAT-P-23b: Four Massive Transiting Extrasolar Planets
http://arxiv.org/abs/1008.3388

Abstract wrote:

We report the discovery of four relatively massive (2-7MJ) transiting extrasolar planets. HAT-P-20b orbits a V=11.339 K3 dwarf star with a period P=2.875317+/-0.000004d. The host star has a mass of 0.760+/-0.03 Msun, radius of 0.690+/-0.02 Rsun, Teff=4595+/-80 K, and metallicity [Fe/H]=+0.35+/-0.08. HAT-P-20b has a mass of 7.246+/-0.187 MJ, and radius of 0.867+/-0.033 RJ yielding a mean density of 13.78+/-1.50 gcm^-3 , which is the second highest value among all known exoplanets. HAT-P-21b orbits a V=11.685 G3 dwarf on an eccentric (e=0.2280+/-0.016) orbit, with a period of P=4.1244810+/-000007d. The host star has a mass of 0.95+/-0.04Msun, radius of 1.10+/-0.08Rsun, Teff=5588+/-80K, and [Fe/H]=+0.01+/-0.08. HAT-P-21b has a mass of 4.063+/-0.161MJ, and radius of 1.024+/-0.092RJ. HAT-P-22b orbits the V=9.732 G5 dwarf HD233731, with P=3.2122200+/-0.000009d. The host star has a mass of 0.92+/-0.03Msun, radius of 1.04+/-0.04Rsun, Teff=5302+/-80K, and metallicity of +0.24+/-0.08. The planet has a mass of 2.147+/-0.061 MJ, and compact radius of 1.080+/-0.058RJ. The host star also harbors an M-dwarf companion at a wide separation. Finally, HAT-P-23b orbits a V=12.432 G0 dwarf star, with a period P=1.212884+/-0.000002d. The host star has a mass of 1.13+/-0.04sun, radius of 1.20+/-0.07Rsun, Teff=5905+/-80K, and [Fe/H]=+0.15+/-0.04. The planetary companion has a mass of 2.090+/-0.111MJ, and radius of 1.368+/-0.090RJ (abridged).

HAT-P-24b: An inflated hot-Jupiter on a 3.36d period transiting a hot, metal-poor star
http://arxiv.org/abs/1008.3389

Abstract wrote:

We report the discovery of HAT-P-24b, a transiting extrasolar planet orbiting the moderately bright V=11.818 F8 dwarf star GSC 0774-01441, with a period P = 3.3552464 +/- 0.0000071 d, transit epoch Tc = 2455216.97669 +/- 0.00024 (BJD_UTC), and transit duration 3.653 +/- 0.025 hours. The host star has a mass of 1.186 +/- 0.042 Msun , radius of 1.294 +/- 0.071 Rsun , effective temperature 6373 +/- 80 K, and a low metallicity of [Fe/H] = -0.16 +/- 0.08. The planetary companion has a mass of 0.681 +/- 0.031 MJ , and radius of 1.243 +/- 0.072 RJ yielding a mean density of 0.439 +/- 0.069 g cm-3 . By repeating our global fits with different parameter sets, we have performed a critical investigation of the fitting techniques used for previous HAT planetary discoveries. We find that the system properties are robust against the choice of priors. The effects of fixed versus fitted limb darkening are also examined. HAT-P-24b probably maintains a small eccentricity of e = 0.052 +0.022 -0.017, which is accepted over the circular orbit model with false alarm probability 5.8%. In the absence of eccentricity pumping, this result suggests HAT-P-24b experiences less tidal dissipation than Jupiter. Due to relatively rapid stellar rotation, we estimate that HAT-P-24b should exhibit one of the largest known Rossiter-McLaughlin effect amplitudes for an exoplanet (deltaVRM ~ 95 m/s) and thus a precise measurement of the sky-projected spin-orbit alignment should be possible.

As rapid progress in the field of transit of planets!

During the first 8 months of 2010 announced a third of all known transit of planets.

Today, the way an interesting report.

http://www.obs-hp.fr/ohp2010/submitted_abstracts-100817.pdf

Quote :

David Charbonneau (inv)
Institute: Harvard Smithsonian Center for Astrophysics, Cambridge
Title 2010: The Year We Make (Second) Contact
Abstract:
The landscale surrounding ground-based surveys for transiting exoplanets has changed
dramatically: Eighty transiting exoplanets have been published, dozens more wait in the
wings, and both the Corot and Kepler Missions are regularly making new discoveries. The
time may soon come when the number of transiting planets discovered from space
eclipses that from the ground. I will begin with a review of the recent progress in both
ground-based efforts to discover transiting planets, and efforts from both ground and
space to characterize these systems. I will then motivate investigations that appear ripe
for progress in the coming 5 years, and consider the role of ground-based discovery efforts
during this exciting epoch.

Maybe some other transit planets announce? The title is very loud sounds - "2010: The Year We Make (Second) Contact"

Awesome release of planets. But don't forget about HAT-P-17. Or is its number not so... lucky?

Density HAT-P 20 b is 13.8 g/cm3 quite large in my opinion is it possible that this planet has solid surface with radius 0.867 jupiter??

Maybe big rocky planet hehe