Validation of TESS exoplanet candidates orbiting solar analogues in the all-sky PLATO input catalogue

Mantovan, Giacomo; Montalto, M.; Piotto, G.; Wilson, T. G.; Cameron, A. Collier; Majidi, F. Z.; Borsato, L.; Granata, V.; Nascimbeni, V.

doi:10.1093/mnras/stac2451

Cited by 9 publications

(1 citation statement)

References 51 publications

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“…Exoplanet candidate lists from large-scale efforts of transit detection and vetting include the Kepler Objects of Interest (Jenkins et al 2010(Jenkins et al , 2020Batalha et al 2010;McCauliff et al 2015;Coughlin et al 2014), NGTS Armstrong et al (2018), AstroNet (Yu et al 2019), TESS Objects of Interest (TOIs, Guerrero et al 2021), and DIAmante TESS candidates (Montalto et al 2020). Additional recent vetting efforts include Zink et al (2021), Dvash et al (2022), Ofman et al (2022), Kunimoto et al (2022), Kostov et al (2022), Cacciapuoti et al (2022), Mantovan et al (2022), and Magliano et al (2023). McCauliff et al (2015); Coughlin et al (2016) and autovet for ground-based NGTS data by Armstrong et al (2018).…”

Section: Introductionmentioning

confidence: 99%

DIAmante TESS AutoRegressive Planet Search (DTARPS): II. Hundreds of New TESS Candidate Exoplanets

Melton¹,

Feigelson²,

Montalto³

et al. 2023

Preprint

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The DIAmante TESS AutoRegressive Planet Search (DTARPS) project seeks to identify photometric transiting planets from 976,814 southern hemisphere stars observed in Year 1 of the TESS mission. This paper follows the methodology developed by Melton et al. (2022a, Paper I) using light curves extracted and pre-processed by the DIAmante project (Montalto et al. 2020). Paper I emerged with a list of 7,377 light curves with statistical properties characteristic of transiting planets but dominated by False Alarms and False Positives. Here a multistage vetting procedure is applied including: centroid motion and crowding metrics, False Alarm and False Positive reduction, photometric binary elimination, and ephemeris match removal. The vetting produces a catalog of 462 DTARPS Candidates across the southern ecliptic hemisphere and 310 objects in a spatially incomplete Galactic Plane list. Fifty-eight percent were not previously identified as transiting systems. Candidates are flagged for possible blending from nearby stars based on Zwicky Transient Facility data and for possible radial velocity variations based on Gaia satellite data. Orbital periods and planetary radii are refined using astrophysical modeling; the resulting parameters closely match published values for Confirmed Planets. Their properties are discussed in Paper III.

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Section: Introductionmentioning

confidence: 99%

DIAmante TESS AutoRegressive Planet Search (DTARPS): II. Hundreds of New TESS Candidate Exoplanets

Melton¹,

Feigelson²,

Montalto³

et al. 2023

Preprint

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The GAPS programme at TNG

Maldonado¹,

Petralia²,

Mantovan³

et al. 2023

A&A

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Context. Massive substellar companions orbiting active low-mass stars are rare. They, however, offer an excellent opportunity to study the main mechanisms involved in the formation and evolution of substellar objects. Aims. We aim to unravel the physical nature of the transit signal observed by the TESS space mission on the active M dwarf TOI-5375. Methods. We analysed the available TESS photometric data as well as high-resolution (R ~ 115 000) HARPS-N spectra. We combined these data to characterise the star TOI-5375 and to disentangle signals related to stellar activity from the companion transit signal in the light-curve data. We ran a Markov chain Monte Carlo analysis to derive the orbital solution and applied state-of-the-art Gaussian process regression to deal with the stellar activity signal. Results. We reveal the presence of a companion in the boundary between the brown dwarfs and the very-low-mass stars orbiting around the star TOI-5375. The best-fit model corresponds to a companion with an orbital period of 1.721564 ± 10−6 d, a mass of 77 ± 8 MJ, and a radius of 0.99 ± 0.16 RJ. Conclusions. We derive a rotation period for the host star of 1.9692 ± 0.0004 d, and we conclude that the star is very close to synchronising its rotation with the orbital period of the companion.

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The GAPS programme at TNG

Mantovan,

Malavolta,

Desidera

et al. 2024

A&A

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Short-period giant planets ($P$\,lesssim \,10 days p J $) are frequently found to be solitary compared to other classes of exoplanets. Small inner companions to giant planets with $P$\,lesssim \,15 days are known only in five compact systems: WASP-47, Kepler-730, WASP-132, TOI-1130, and TOI-2000. Here, we report the confirmation of TOI-5398, the youngest known compact multi-planet system composed of a hot sub-Neptune (TOI-5398 c c $\,=\,4.77271 days) orbiting interior to a short-period Saturn (TOI-5398 b b $\,=\,10.590547 days) planet, both transiting around a 650\,pm \,150 Myr G-type star. As part of the Global Architecture of Planetary Systems (GAPS) Young Object project, we confirmed and characterised this compact system, measuring the radius and mass of both planets, thus constraining their bulk composition. Using multi-dimensional Gaussian processes, we simultaneously modelled stellar activity and planetary signals from the Transiting Exoplanet Survey Satellite ( TESS ) Sector 48 light curve and our High Accuracy Radial velocity Planet Searcher (HARPS-N) radial velocity (RV) time series. We confirmed the planetary nature of both planets, TOI-5398 b and TOI-5398 c, and obtained a precise estimation of their stellar parameters. Through the use of astrometric, photometric, and spectroscopic observations, our findings indicate that TOI-5398 is a young, active G dwarf star (650\,pm \,150 Myr) with a rotational period of rot $\,=\,7.34 days. The transit photometry and RV measurements enabled us to measure both the radius and mass of planets b, $R_b$\,=\,10.30pm 0.40 oplus $, $M_b$\,=\,58.7pm 5.7 oplus $, and c, $R_c$\,=\,3.52\,pm \,0.19 oplus $, $M_c$\,=\,11.8pm 4.8 oplus TESS observed TOI-5398 during sector 48 and no further observations are planned in the current Extended Mission, making our ground-based light curves crucial for improvement of the ephemeris. With a transmission spectroscopy metric (TSM) value of around 300, TOI-5398 b is the most amenable warm giant (10\,<\,$P$\,<\,100 days) for JWST atmospheric characterisation.

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Validation of TESS exoplanet candidates orbiting solar analogues in the all-sky PLATO input catalogue

Cited by 9 publications

References 51 publications

DIAmante TESS AutoRegressive Planet Search (DTARPS): II. Hundreds of New TESS Candidate Exoplanets

DIAmante TESS AutoRegressive Planet Search (DTARPS): II. Hundreds of New TESS Candidate Exoplanets

The GAPS programme at TNG

The GAPS programme at TNG

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