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A super-Earth and two sub-Neptunes transiting the nearby and quiet M dwarf TOI-270

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arxiv 1903.06107 v2 pith:DOQGGS72 submitted 2019-03-14 astro-ph.EP

Maximilian N. Günther , Francisco J. Pozuelos , Jason A. Dittmann , Diana Dragomir , Stephen R. Kane , Tansu Daylan , Adina D. Feinstein , Chelsea Huang
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Timothy D. Morton Andrea Bonfanti L. G. Bouma Jennifer Burt Karen A. Collins Jack J. Lissauer Elisabeth Matthews Benjamin T. Montet Andrew Vanderburg Songhu Wang Jennifer G. Winters George R. Ricker Roland K. Vanderspek David W. Latham Sara Seager Joshua N. Winn Jon M. Jenkins James D. Armstrong Khalid Barakoui Natalie Batalha Jacob L. Bean Douglas A. Caldwell David R. Ciardi Kevin I. Collins Ian Crossfield Michael Fausnaugh Gabor Furesz Tianjun Gan Michaël Gillon Natalia Guerrero Keith Horne Steve B. Howell Michael Ireland Giovanni Isopi Emmanuël Jehin John F. Kielkopf Sebastien Lepine Franco Mallia Rachel A. Matson Gordon Myers Enric Palle Samuel N. Quinn Howard M. Relles Bárbara Rojas-Ayala Joshua Schlieder Ramotholo Sefako Avi Shporer Juan C. Suárez Thiam-Guan Tan Eric B. Ting Joseph D. Twicken Ian A. Waite
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keywords toi-270planetsearthsmalltransitingcharacterisationdwarfenables
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We report the Transiting Exoplanet Survey Satellite discovery of three small planets transiting one of the nearest and brightest M dwarf hosts to date, TOI-270 (TIC 259377017; K-mag 8.3; 22.5 parsec). The M3V-type star is transited by the super-Earth-sized TOI-270 b (1.247+0.089-0.083 R_earth) and the sub-Neptune-sized exoplanets TOI-270 c (2.42+-0.13 R_earth) and TOI-270 d (2.13+-0.12 R_earth). The planets orbit close to a mean-motion resonant chain, with periods (3.36, 5.66, and 11.38 days) near ratios of small integers (5:3 and 2:1). TOI-270 is a prime target for future studies since: 1) its near-resonance allows detecting transit timing variations for precise mass measurements and dynamical studies; 2) its brightness enables independent radial velocity mass measurements; 3) the outer planets are ideal for atmospheric characterisation via transmission spectroscopy; and 4) the quiet star enables future searches for habitable zone planets. Altogether, very few systems with small, temperate exoplanets are as suitable for such complementary and detailed characterisation as TOI-270.

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  1. GJ357: A low-mass planetary system uncovered by precision radial-velocities and dynamical simulations

    astro-ph.EP 2019-09 conditional novelty 5.0 of 10

    GJ 357 hosts three confirmed planets, and the transiting one is a dense (about 7.76 grams per cubic centimeter), likely iron-dominated super-Earth, giving the field a nearby benchmark system.

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