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26 April 2024

» arxiv » 2001.0954

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The First Habitable Zone Earth-Sized Planet From TESS II: $Spitzer$ Confirms TOI-700 d
Joseph E. Rodriguez ; Andrew Vanderburg ; Sebastian Zieba ; Laura Kreidberg ; Caroline V. Morley ; Stephen R. Kane ; Alton Spencer ; Samuel N. Quinn ; Jason D. Eastman ; Ryan Cloutier ; Chelsea X. Huang ; Karen A. Collins ; Andrew W. Mann ; Emily Gilbert ; Joshua E. Schlieder ; Elisa V. Quintana ; Thomas Barclay ; Gabrielle Suissa ; Ravi kumar Kopparapu ; Courtney D. Dressing ; George R. Ricker ; Roland K. Vanderspek ; David W. Latham ; Sara Seager ; Joshua N. Winn ; Jon M. Jenkins ; Zachory Berta-Thompson ; Patricia T. Boyd ; David Charbonneau ; Douglas A. Caldwell ; Eugene Chiang ; Jessie L. Christiansen ; David R. Ciardi ; Knicole D. Colón ; John Doty ; Tianjun Gan ; Natalia Guerrero ; Maximilian N. Günther ; Eve J. Lee ; Alan M. Levine ; Eric Lopez ; Philip S. Muirhead ; Elisabeth Newton ; Mark E. Rose ; Joseph D. Twicken ; Jesus Noel Villaseñor ;
Date:	3 Jan 2020
Abstract:	We present $Spitzer$ 4.5$mu$m observations of the transit of TOI-700 d, a habitable zone Earth-sized planet in a multiplanet system transiting a nearby M-dwarf star (TIC 150428135, 2MASS J06282325-6534456). TOI-700 d has a radius of $1.220^{+0.073}_{-0.063}R_oplus$ and orbits within its host star’s conservative habitable zone with a period of 37.42 days ($T_mathrm{eq} sim 269$ K). TOI-700 also hosts two small inner planets (R$_b$=$1.044^{+0.065}_{-0.063}R_oplus$ & R$_c$=$2.64^{+0.16}_{-0.14}R_oplus$) with periods of 9.98 and 16.05 days, respectively. Our $Spitzer$ observations confirm the TESS detection of TOI-700 d and remove any remaining doubt that it is a genuine planet. We analyze the $Spitzer$ light curve combined with the 11 sectors of TESS observations and a transit of TOI-700 c from the LCOGT network to determine the full system parameters. With an expected RV semi-amplitude of $sim$80 cm/s, it may be possible to measure the mass of TOI-700 d using state-of-the-art radial velocity instruments.
Source:	arXiv, 2001.0954
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