TESS News and Results

A super-Earth and sub-Neptune transiting the late-type M dwarf LP 791-18

https://arxiv.org/abs/1906.09267

the Third planet in the habitable zone was found in the planetary system LP 791-18 the planet LP 791-18d with the possibility of Volcanic activity.

A temperate Earth-sized planet with tidal heating transiting an M6 star

https://www.nature.com/articles/s41586-023-05934-8

The TESS-Keck Survey. XV. Precise Properties of 108 TESS Planets and Their Host Stars
https://arxiv.org/abs/2306.00251

Several TOIs confirmed.

A shipment of new/confirmed TESS planets

Two Warm Neptunes transiting HIP 9618 revealed by TESS & Cheops
https://arxiv.org/abs/2306.04450

TESS and CHEOPS Discover Two Warm Sub-Neptunes Transiting the Bright K-dwarf HD 15906
https://arxiv.org/abs/2306.04511

Refined parameters of the HD 22946 planetary system and the true orbital period of planet d
https://arxiv.org/abs/2306.04468

TOI-5678 b: A 48-day transiting Neptune-mass planet characterized with CHEOPS and HARPS
https://arxiv.org/abs/2306.04295

A Transiting Super-Earth in the Radius Valley and An Outer Planet Candidate Around HD 307842
https://arxiv.org/abs/2306.14655

Quote :

We report the confirmation of a TESS-discovered transiting super-Earth planet orbiting a mid-G star, HD 307842 (TOI-784). The planet has a period of 2.8 days, and the radial velocity (RV) measurements constrain the mass to be 9.67+0.83/-0.82 [Earth Masses]. We also report the discovery of an additional planet candidate on an outer orbit that is most likely non-transiting. The possible periods of the planet candidate are approximately 20 to 63 days, with the corresponding RV semi-amplitudes expected to range from 3.2 to 5.4 m/s and minimum masses from 12.6 to 31.1 [Earth Masses]. The radius of the transiting planet (planet b) is 1.93+0.11/-0.09 [Earth Radii], which results in a mean density of 7.4+1.4/-1.2 g/cm^3 suggesting that TOI-784b is likely to be a rocky planet though it has a comparable radius to a sub-Neptune. We found TOI-784b is located at the lower edge of the so-called ``radius valley'' in the radius vs. insolation plane, which is consistent with the photoevaporation or core-powered mass loss prediction. The TESS data did not reveal any significant transit signal of the planet candidate, and our analysis shows that the orbital inclinations of planet b and the planet candidate are 88.60+0.84/-0.86 degrees and <= 88.3-89.2 degrees, respectively. More RV observations are needed to determine the period and mass of the second object, and search for additional planets in this system.

The TESS-Keck Survey. XVI. Mass Measurements for 12 Planets in Eight Systems
https://arxiv.org/abs/2306.16587

Quote :

With JWST's successful deployment and unexpectedly high fuel reserves, measuring the masses of sub-Neptunes transiting bright, nearby stars will soon become the bottleneck for characterizing the atmospheres of small exoplanets via transmission spectroscopy. Using a carefully curated target list and more than two years' worth of APF-Levy and Keck-HIRES Doppler monitoring, the TESS-Keck Survey is working toward alleviating this pressure. Here we present mass measurements for 11 transiting planets in eight systems that are particularly suited to atmospheric follow-up with JWST. We also report the discovery and confirmation of a temperate super-Jovian-mass planet on a moderately eccentric orbit. The sample of eight host stars, which includes one subgiant, spans early-K to late-F spectral types (Teff= 5200--6200 K). We homogeneously derive planet parameters using a joint photometry and radial velocity modeling framework, discuss the planets' possible bulk compositions, and comment on their prospects for atmospheric characterization.

TOI 4201 b and TOI 5344 b: Discovery of Two Transiting Giant Planets Around M Dwarf Stars and Revised Parameters for Three Others
https://arxiv.org/abs/2307.06809

TOI-4201: An Early M-dwarf Hosting a Massive Transiting Jupiter Stretching Theories of Core-Accretion
https://arxiv.org/abs/2307.06880

For those who didn't notice it (including me), former paper states/confirms TOI-3714 to host a white dwarf companion at 2.67'' (i.e. 300 AUs).

HD 212729 b (TOI-1052.01) is confirmed, and a second planet is identified as well.

Discovery and characterisation of two Neptune-mass planets orbiting HD 212729 with TESS
https://academic.oup.com/mnras/advance-article/doi/10.1093/mnras/stad2183/7227347?login=false

Transit Timing Variations in the three-planet system: TOI-270

Quote :

We present ground and space-based photometric observations of TOI-270 (L231-32), a system of three transiting planets consisting of one super-Earth and two sub-Neptunes discovered by TESS around a bright (K-mag=8.25) M3V dwarf. The planets orbit near low-order mean-motion resonances (5:3 and 2:1), and are thus expected to exhibit large transit timing variations (TTVs). Following an extensive observing campaign using 8 different observatories between 2018 and 2020, we now report a clear detection of TTVs for planets c and d, with amplitudes of ∼10 minutes and a super-period of ∼3 years, as well as significantly refined estimates of the radii and mean orbital periods of all three planets.
Dynamical modeling of the TTVs alone puts strong constraints on the mass ratio of planets c and d and on their eccentricities. When incorporating recently published constraints from radial velocity observations, we obtain masses of Mb=1.48±0.18M⊕, Mc=6.20±0.31M⊕ and Md=4.20±0.16M⊕ for planets b, c and d, respectively. We also detect small, but significant eccentricities for all three planets : eb=0.0167±0.0084, ec=0.0044±0.0006 and ed=0.0066±0.0020. Our findings imply an Earth-like rocky composition for the inner planet, and Earth-like cores with an additional He/H2O atmosphere for the outer two. TOI-270 is now one of the best-constrained systems of small transiting planets, and it remains an excellent target for atmospheric characterization.

Interesting detection: a pair of transiting gas giants in long period orbits.

TOI-4600 b and c: Two long-period giant planets orbiting an early K dwarf
https://arxiv.org/abs/2308.15572

Edasich wrote:

TOI-332 b: a super dense Neptune found deep within the Neptunian desert
https://arxiv.org/abs/2308.12137

An even more, absurdly more, dense planet.

A super-massive Neptune-sized planet
https://www.nature.com/articles/s41586-023-06499-2

Quote :

Here we show observations of the transiting planet TOI-1853 b, which has a radius of 3.46 ± 0.08 Earth radii and orbits a dwarf star every 1.24 days. This planet has a mass of 73.2 ± 2.7 Earth masses, almost twice that of any other Neptune-sized planet known so far, and a density of 9.7 ± 0.8 grams per cubic centimetre.

This thing has six times Earth's surface gravity