VaTEST. II. Statistical Validation of 11 TESS-detected Exoplanets Orbiting K-type Stars

Mistry, Priyashkumar; Pathak, Kamlesh; Prasad, Aniket; Lekkas, Georgios; Bhattarai, Surendra; Gharat, Sarvesh; Maity, Mousam; Kumar, Dhruv; Collins, Karen A.; Schwarz, Richard P.; Mann, Christopher R.; Furlan, Elise; Howell, Steve B.; Ciardi, David R.; Bieryla, Allyson; Matthews, Elisabeth C.; Gonzales, Erica J.; Ziegler, Carl; Crossfield, Ian J. M.; Giacalone, Steven; Tan, T. G.; Evans, P.; Hełminiak, K. G.; Collins, Kevin I.; Narita, Norio; Fukui, A.; Pozuelos, F. J.; Dressing, Courtney D.; Soubkiou, Abderahmane; Benkhaldoun, Z.; Schlieder, Joshua E.; Suárez, Olga; Barkaoui, Khalid; Πάλλη, Ε.; Murgas, F.; Srdoč, Gregor; Goliguzova, Maria V.; Strakhov, Ivan A.; Gnilka, Crystal L.; Lester, Kathryn V.; Scott, Nicholas J.; Matson, Rachel A.; Gillon, M.; Jehin, Emmanuël; Timmermans, Mathilde; Ghachoui, Mourad; Abe, Lyu; Bendjoya, Philippe; Guillot, T.; Triaud, A. H. M. J.

doi:10.3847/1538-3881/acd548

Cited by 4 publications

(2 citation statements)

References 54 publications

(48 reference statements)

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“…This star is not listed in the HGCA, and therefore it has no available astrometric trend. However, we included direct imaging of this system (Mistry et al 2023) obtained in the I band (832 nm) with the 'Alopeke speckle imager (Scott et al 2021) in our analysis. We provide the posteriors from our partial orbit analysis of each slice in Figure 5.…”

Section: Case Study: Toi-1694's Companion Mass Is Bounded By Direct I...mentioning

confidence: 99%

ethraid: A Simple Method for Characterizing Long-period Companions Using Doppler, Astrometric, and Imaging Constraints

Van Zandt,

Petigura

2024

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We present ethraid, an open-source Python package designed to measure the mass (m c ) and separation (a) of a bound companion from measurements covering a fraction of the orbital period. ethraid constrains m c and a by jointly modeling radial velocity, astrometric, and/or direct imaging data in a Bayesian framework. Partial orbit data sets, especially those with highly limited phase coverage, are represented well by a few method-specific summary statistics. By modeling these statistics rather than the original data, ethraid optimizes computational efficiency with minimal reduction in accuracy. ethraid uses importance sampling to efficiently explore the often broad posteriors that arise from partial orbits. The core computations of ethraid are implemented in Cython for speed. We validate ethraid's performance by using it to constrain the masses and separations of the planetary companions to HD 117207 and TOI-1694. We designed ethraid to be both fast and simple, as well as to give broad, “quick look” constraints on companion parameters using minimal data. ethraid is pip installable and available on Zenodo and GitHub.

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Section: Case Study: Toi-1694's Companion Mass Is Bounded By Direct I...mentioning

confidence: 99%

ethraid: A Simple Method for Characterizing Long-period Companions Using Doppler, Astrometric, and Imaging Constraints

Van Zandt,

Petigura

2024

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“…This was a sub-Saturn (smaller than Saturn) with the largest H/He envelope among all the known sub-Saturns and was massive enough to survive the photoevaporation. Our second paper was about the validation of 11 new exoplanets orbiting K spectral type stars (Mistry et al 2023b). In the mentioned study, we identified several systems conducive to atmospheric characterisation through different spectroscopic techniques.…”

Section: Introductionmentioning

confidence: 99%

VaTEST III: Validation of eight potential super-earths from TESS data

Mistry,

Prasad,

Maity

et al. 2024

Publ. Astron. Soc. Aust.

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NASA’s all-sky survey mission, the Transiting Exoplanet Survey Satellite (TESS), is specifically engineered to detect exoplanets that transit bright stars. Thus far, TESS has successfully identified approximately 400 transiting exoplanets, in addition to roughly 6000 candidate exoplanets pending confirmation. In this study, we present the results of our ongoing project, the Validation of Transiting Exoplanets using Statistical Tools (VaTEST). Our dedicated effort is focused on the confirmation and characterization of new exoplanets through the application of statistical validation tools. Through a combination of ground-based telescope data, high-resolution imaging, and the utilization of the statistical validation tool known as TRICERATOPS, we have successfully discovered eight potential super-Earths. These planets bear the designations: TOI-238b ( R⊕), TOI-771b ( R⊕), TOI-871b ( R⊕), TOI-1467b ( R⊕), TOI-1739b ( R⊕), TOI-2068b ( R⊕), TOI-4559b ( R⊕), and TOI-5799b ( R⊕). Among all these planets, six of them fall within the region known as ’keystone planets,’ which makes them particularly interesting for study. Based on the location of TOI-771b and TOI-4559b below the radius valley we characterized them as likely super-Earths, though radial velocity mass measurements for these planets will provide more details about their characterization. It is noteworthy that planets within the size range investigated herein are absent from our own solar system, making their study crucial for gaining insights into the evolutionary stages between Earth and Neptune.

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The GAPS programme at TNG

Naponiello,

Bonomo,

Mancini

et al. 2024

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Super-Earths and sub-Neptunes are the most common types of planets outside the Solar System and likely represent the link between terrestrial planets and gas giants. Characterizing their physical and orbital properties and studying their multiplicity are key steps in testing and understanding their formation, migration, and evolution. We examined the star BD+00\,444 (GJ\,105.5, TOI-2443; $V=9.5$\,mag; $d=23.9$\,pc) in depth, with the aim of characterizing and confirming the planetary nature of its small companion, the planet candidate TOI-2443.01, which was discovered by the TESS space telescope and subsequently validated by a follow-up statistical study. We monitored BD+00\,444 with the HARPS-N spectrograph for 1.5 years to search for planet-induced radial-velocity (RV) variations, and then analyzed the RV measurements jointly with TESS and ground-based photometry. We determined that the host is a quiet K5\,V star with a radius of star sun $ and a mass of $M_ star sun $. We revealed that the sub-Neptune BD+00\,444\,b has a radius of b oplus $, a mass of $M_ b oplus $, and consequently a rather low-density value of $ b $, which makes it compatible with both an Earth-like rocky interior with a thin H-He atmosphere and a half-rocky, half-water composition with a small amount of H-He. With an orbital period of about 15.67 days and an equilibrium temperature of about 519 K, BD+00\,444\,b has an estimated transmission spectroscopy metric (TSM) of $, which makes it ideal for atmospheric follow-up with the James Webb Space Telescope. Notably, it is the second most eccentric inner transiting planet among those with well-determined eccentricities, with $e=0.302^ oplus $. We estimated that tidal forces from the host star affect both the rotation and eccentricity of planet b, and strong tidal dissipation may signal intense volcanic activity. Furthermore, our analysis suggests the presence of a sub-Neptune-mass planet candidate, BD+00\,444\,c, which would have an orbital period of c and a minimum mass of c i oplus $. With an equilibrium temperature of about 283 K, BD+00\,444\,c is inside the habitable zone; however, confirmation of this candidate would require further observations and stronger statistical evidence. We explored the formation and migration of both planets by means of population synthesis models, which reveal that both planets started their formation beyond the water snowline during the earliest phases of the life of their protoplanetary disk.

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VaTEST. II. Statistical Validation of 11 TESS-detected Exoplanets Orbiting K-type Stars

Cited by 4 publications

References 54 publications

ethraid: A Simple Method for Characterizing Long-period Companions Using Doppler, Astrometric, and Imaging Constraints

ethraid: A Simple Method for Characterizing Long-period Companions Using Doppler, Astrometric, and Imaging Constraints

VaTEST III: Validation of eight potential super-earths from TESS data

The GAPS programme at TNG

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