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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Re: TESS News and Results

Post by Lazarus on 23rd January 2019, 2:39 pm

Possibly there are co-orbital planets at TOI-178 in a 3:2:2 resonance, though a 4:3:2 resonance cannot be ruled out. Somewhat reminiscent of KOI-730...

Leleu et al. "Co-orbital exoplanets from close period candidates: The TOI-178 case"
https://arxiv.org/abs/1901.07250
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Re: TESS News and Results

Post by Sirius_Alpha on 28th January 2019, 9:50 pm

Near-resonance in a system of sub-Neptunes from TESS
https://arxiv.org/abs/1901.09092

We report the Transiting Exoplanet Survey Satellite (TESS) detection of a multi-planet system orbiting the V=10.9 K0 dwarf TOI 125. We find evidence for up to five planets, with varying confidence. Three high signal-to-noise transit signals correspond to sub-Neptune-sized planets (2.76, 2.79, and 2.94 R⊕), and we statistically validate the planetary nature of the two inner planets (Pb=4.65 days, Pc=9.15 days). With only two transits observed, we report the outer object (P.03=19.98 days) as a high signal-to-noise ratio planet candidate. We also detect a candidate transiting super-Earth (1.4 R⊕) with an orbital period of only 12.7 hours and a candidate Neptune-sized planet (4.2 R⊕) with a period of 13.28 days, both at low signal-to-noise. This system is amenable to mass determination via radial velocities and transit timing variations, and provides an opportunity to study planets of similar size while controlling for age and environment. The ratio of orbital periods between TOI 125 b and c (Pc/Pb=1.97) is slightly smaller than an exact 2:1 commensurability and is atypical of multiple planet systems from Kepler, which show a preference for period ratios just wide of first-order period ratios. A dynamical analysis refines the allowed parameter space through stability arguments and suggests that, despite the nearly commensurate periods, the system is unlikely to be in resonance.

TOI-125 = TYC 8856-192-1.
Given that the innermost planet has a low SNR, and is significantly misaligned with the rest of the system, it may be more likely that the planet doesn't exist than that it's that badly misaligned.

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Re: TESS News and Results

Post by Sirius_Alpha on 30th January 2019, 7:18 am

An Eccentric Massive Jupiter Orbiting a Sub-Giant on a 9.5 Day Period Discovered in the Transiting Exoplanet Survey Satellite Full Frame Images
https://arxiv.org/abs/1901.09950

We report the discovery of TOI-172 b from the Transiting Exoplanet Survey Satellite (TESS) mission, a massive hot Jupiter transiting a slightly evolved G-star with a 9.48-day orbital period. This is the first planet to be confirmed from analysis of only the TESS full frame images, because the host star was not chosen as a two minute cadence target. From a global analysis of the TESS photometry and follow-up observations carried out by the TESS follow-up working group, TOI-172 (TIC 29857954) is a slightly evolved star with an effective temperature of Teff =564450~K, a mass of M⋆ = 1.124+0.063−0.060 M⊙, radius of R⋆ = 1.774+0.046−0.043 R⊙, a surface gravity of log g⋆ = 3.993+0.026−0.027, and an age of 7.5+1.6−1.4 Gyr. Its planetary companion (TOI-172 b) has a radius of RP = 0.965+0.033−0.030 RJ, a mass of MP = 5.41+0.21−0.20 MJ, and is on an eccentric orbit (e = 0.3805+0.0092−0.0090). TOI-172 b is one of the few known massive giant planets on a highly eccentric short-period orbit. Future study of the atmosphere of this planet and its system architecture offer opportunities to understand the formation and evolution of similar systems.

TOI-172 = TYC 6932-301-1

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Re: TESS News and Results

Post by Sirius_Alpha on 11th February 2019, 10:24 pm

A resonant pair of warm giant planets revealed by TESS
https://arxiv.org/abs/1902.03900

We present the discovery of a pair of transiting giant planets, TOI-216b and c, using four sectors of TESS photometry. TOI-216 is a 0.87M⊙ dwarf orbited by two transiters with radii of 8.2R⊕ and 11.3R⊕, and periods of 17.01d and 34.57d, respectively. Anti-correlated TTVs are clearly evident indicating that the transiters orbit the same star and interact via a near 2:1 mean motion resonance. By fitting the TTVs with a dynamical model, we infer masses of 26+24−11M⊕ and 190+220−80M⊕, establishing that the objects are planetary in nature and have sub-Kronian and Kronian densities. TOI-216 lies close to the southern ecliptic pole and thus will be observed by TESS throughout the first year, providing an opportunity for continuous dynamical monitoring and considerable refinement of the dynamical masses presented here. TOI-216 closely resembles Kepler-9 in architecture, and we hypothesize that in such systems these Saturn-analogs failed to fully open a gap and thus migrated far deeper into the system before becoming trapped into resonance, which would imply that future detections of new analogs may also have sub-Jupiter masses.

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Re: TESS News and Results

Post by Led_Zep on 12th February 2019, 7:28 pm

abstract : "sub-Kronian and Kronian densities" : what does it mean ? it's about Saturn satellites ?
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Re: TESS News and Results

Post by Sirius_Alpha on 12th February 2019, 8:58 pm

Kronos is the Greek god equivalent of Saturn. "sub-Kronian" can be read as "sub-Saturnian."
Not sure why they were trying to be clever with it.

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Re: TESS News and Results

Post by Sirius_Alpha on 26th February 2019, 9:55 pm

TOI-150: A transiting hot Jupiter in the TESS southern CVZ
https://arxiv.org/abs/1902.09710

We report the detection of a hot Jupiter (Mp=1.720.09 MJ, Rp=1.380.04 RJ) orbiting a middle-aged star (logg=4.152+0.030−0.043) in the TESS southern continuous viewing zone (β=−79.59∘). We confirm the planetary nature of the candidate TOI-150.01 using radial velocity observations from the APOGEE-2 South spectrograph and the Carnegie Planet Finder Spectrograph, ground-based photometric observations from the robotic Three-hundred MilliMeter Telescope at Las Campanas Observatory, and Gaia distance estimates. Large scale spectroscopic surveys, such as APOGEE/APOGEE-2, now have sufficient radial velocity precision to directly confirm the signature of giant exoplanets, making such data sets valuable tools in the TESS-era. Continual monitoring of TOI-150 by TESS can reveal additional planets and subsequent observations can provide insights into planetary system architectures involving a hot Jupiter around a star about halfway through its main-sequence life.
TOI-150 = TYC 9191-519-1.

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Re: TESS News and Results

Post by Sirius_Alpha on 13th March 2019, 9:09 pm

A hot rocky and a warm puffy super-Earth orbiting TOI-402 (HD 15337)
https://arxiv.org/abs/1903.05419

The HD 15337 transiting system: a pair of sub-Neptune-mass planets on the opposite sides of the radius gap
https://arxiv.org/abs/1903.05623

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Re: TESS News and Results

Post by Sirius_Alpha on 14th March 2019, 8:37 pm

A Super-Earth and two sub-Neptunes transiting the bright, nearby, and quiet M-dwarf TOI-270
https://arxiv.org/abs/1903.06107

We report the Transiting Exoplanet Survey Satellite (TESS) discovery of three small planets transiting one of the brightest (K-mag 8.3) and nearest (22.5 parsec) M-dwarf hosts to date, TOI-270 (TIC 259377017). The system is observationally favourable, and can be exceptionally well characterised over the next few years. The M3V-type star is transited by the Super-Earth-sized TOI-270b (1.25 Rearth) and the sub-Neptune-sized exoplanets TOI-270 c (2.42 Rearth) and TOI-270 d (2.13 Rearth). The planet configuration is close to a mean-motion resonant chain, with the orbital periods (3.36, 5.66, and 11.38 days) near ratios of small integers (5:3 and 2:1). Notably, the equilibrium temperature of the outer planet (340 K) lies within the survivable range for extremophile organisms. TOI-270 will be a prime target for future studies since: 1) its near-resonance allows the detection of transit timing variations (TTVs) for precise mass measurements and detailed dynamical studies; 2) its brightness enables independent radial velocity (RV) mass measurements; 3) the outer planets are ideal for atmospheric characterisation via transmission spectroscopy with the James Webb Space Telescope (JWST); and 4) the quiet host star is well suited for future searches of terrestrial planets within the habitable zone. Altogether, very few systems with temperate small exoplanets are as suitable for complementary characterisation by TTVs, RVs and transmission spectroscopy as TOI-270.

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Re: TESS News and Results

Post by Sirius_Alpha on 19th March 2019, 8:46 pm

HD 213885b: A transiting 1-day-period super-Earth with an Earth-like composition around a bright (V=7.9) star unveiled by TESS
https://arxiv.org/abs/1903.07694

The L 98-59 System: Three Transiting, Terrestrial-Sized Planets Orbiting a Nearby M-dwarf
https://arxiv.org/abs/1903.08017

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