TESS News and Results

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Re: TESS News and Results

Post by Sirius_Alpha on 6th November 2018, 10:33 pm

Another paper on HD 1397. I don't know what's up with arXiv tonight but I'm getting a "no updates found" message for the "new" postings. All postings can be seen if you just browse by year/month.

HD 1397b: a transiting warm giant planet orbiting a V = 7.8 mag sub-giant star discovered by TESS
https://arxiv.org/abs/1811.02156

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Re: TESS News and Results

Post by Sirius_Alpha on 14th November 2018, 9:55 pm

HD2685 b: A Hot-Jupiter orbiting an early F-type star detected by TESS
https://arxiv.org/abs/1811.05518

We report on the confirmation of a transiting giant planet around the relatively hot (Teff = 6801 56 K) star HD2685, whose transit signal was detected in Sector 1 data of the TESS mission. We confirmed the planetary nature of the transit signal by using Doppler velocimetric measurements with CHIRON, CORALIE and FEROS, as well as photometric data with CHAT and LCOGT. From the photometry and radial velocities joint analysis, we derived the following parameters for HD2685 b: P=4.126920.00004 days, MP=1.18 0.09 MJ and RP=1.44 0.01 RJ. This system is a typical example of an inflated transiting Hot-Jupiter in a circular orbit. Given the host star apparent visual magnitude (V = 9.6 mag), this is one of the brightest known stars hosting a transiting Hot-Jupiter, and a good example of the upcoming systems that will be detected by TESS during the two-year primary mission. This is also an excellent target for future ground and space based atmospheric characterization as well as a good candidate for measuring the projected spin-orbit misalignment angle via the Rossiter-McLaughlin effect.

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Re: TESS News and Results

Post by Sirius_Alpha on 18th November 2018, 9:33 pm

About 11 known RV planets should be found to transit by TESS.

Predicted Yield of Transits of Known Radial Velocity Exoplanets from the TESS Primary and Extended Missions
https://arxiv.org/abs/1811.06550

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Re: TESS News and Results

Post by Lazarus on 19th November 2018, 3:57 am

TESS phase curve for WASP-18b

Shporer et al. "TESS full orbital phase curve of the WASP-18b system"
https://arxiv.org/abs/1811.06020
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Re: TESS News and Results

Post by Sirius_Alpha on 11th December 2018, 10:05 pm

TESS exoplanet candidates validated with HARPS archival data. A massive Neptune around GJ\,143 and two Neptunes around HD\,23472
https://arxiv.org/abs/1812.04501

We aim at the discovery of new planetary systems by exploiting the transit light curve results from TESS orbital observatory's Sector 1 and 2 observations and validating them with precise Doppler measurements obtained from archival HARPS data.
Taking advantage of the reported TESS transit events around GJ\,143 (TOI 186) and HD\,23472 (TOI 174) we model their HARPS precise Doppler measurements and derive orbital parameters for these two systems.
For the GJ\,143 system TESS has reported only a single transit, and thus its period is unconstrained from photometry.
Our RV analysis of GJ\,143 reveal the full Keplerian solution of the system, which is consistent with an eccentric planet with a mass almost twice that of Neptune and a period of Pb = 35.59+0.01−0.01 days.
Our estimates of the GJ\,143 b planet are fully consistent with the transit timing from TESS.
We confirm the two-planet system around HD\,23472, which according to our analysis is composed of two Neptune mass planets in a possible 5:3 MMR.

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Re: TESS News and Results

Post by Sirius_Alpha on 16th December 2018, 10:00 pm

HD219666b: a hot-Neptune from TESS Sector 1
https://arxiv.org/abs/1812.05881

We report the discovery of a transiting planet orbiting the old and inactive G7 dwarf star HD219666 (Mstar = 0.92 +/- 0.03 MSun, Rstar = 1.03 +/- 0.03 RSun, tau_star = 10 +/- 2 Gyr). With a mass of Mb = 16.6 +/- 1.3 MEarth, a radius of Rb = 4.71 +/- 0.17 REarth, and an orbital period of P ~ 6 days, HD219666b is a new member of a rare class of exoplanets: the hot-Neptunes. The Transiting Exoplanet Survey Satellite (TESS) observed HD219666 (also known as TOI-118) in its Sector 1 and the light curve shows four transit-like events, equally spaced in time. We confirmed the planetary nature of the candidate by gathering precise radial velocity measurements with HARPS@ESO3.6m. We used the co-added HARPS spectrum to derive the host star fundamental parameters (Teff = 5527 +/- 65 K, log g = 4.40 +/- 0.11 (cgs), [Fe/H]= 0.04 +/- 0.04 dex, log R'HK = -5.07 +/- 0.03), as well as the abundances of many volatile and refractory elements. The host star brightness (V = 9.9) makes it suitable for further characterization by means of in-transit spectroscopy. The determination of the planet orbital obliquity, along with the atmospheric metal-to-hydrogen content and thermal structure could provide us with important clues on the mechanisms of formation of this class of objects.

"HD219666b is a new member of a rare class of exoplanets: the hot-Neptunes" yeah if you say so... Razz

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Re: TESS News and Results

Post by Sirius_Alpha on 3rd January 2019, 3:31 am

The Longest Period TESS Planet Yet: A Sub-Neptune Transiting A Bright, Nearby K Dwarf Star
https://arxiv.org/abs/1901.00051

The future of exoplanet science is bright, as TESS once again demonstrates with the discovery of its longest-period confirmed planet yet, located only 16 pc away. We hereby present HD 21749b (TOI 186.01), a sub-Neptune in a 36-day orbit around a bright (V = 8.1), nearby K4.5 dwarf. TESS measures HD21749b to be 2.84+0.26−0.22 R⊕, and combined archival and follow-up precision radial velocity data put the mass of the planet at 23.20+2.13−1.91 M⊕. HD 21749b is the longest-period TESS planet confirmed to date, and contributes to the TESS Level 1 Science Requirement of providing 50 transiting planets smaller than 4 R⊕ with measured masses. Furthermore, we report the discovery of TOI 186.02, a planet candidate with a 7.8-day period which, if confirmed, could become the first Earth-sized planet discovered by TESS. The HD21749 system is thus a prime candidate for comparative studies of planetary composition and architecture in multi-planet systems.

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Re: TESS News and Results

Post by Lazarus on 3rd January 2019, 3:28 pm

As noted in the paper, HD 21749 = GJ 143, which has been previously mentioned. This second paper does have a lot more follow-up information in it.
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Re: TESS News and Results

Post by Sirius_Alpha on 5th January 2019, 8:33 pm

ExoFOP indicates a total of four planet candidates at HD 23472. In addition to the two confirmed planets with periods of 17.6 and 29.8 days, two more planet candidates at 12.17 and 3.98 days may exist, with radii of 2.01 and 1.01 Earth-radii, respectively.

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