The First Habitable-zone Earth-sized Planet from TESS. II. Spitzer Confirms TOI-700 d

Rodriguez, Joseph E. and Vanderburg, Andrew and Zieba, Sebastian and Kreidberg, Laura and Morley, Caroline V. and Eastman, Jason D. and Kane, Stephen R. and Spencer, Alton and Quinn, Samuel N. and Cloutier, Ryan and Huang, Chelsea X. ORCID: https://orcid.org/0000-0003-0918-7484 and Collins, Karen A. and Mann, Andrew W. and Gilbert, Emily and Schlieder, Joshua E. and Quintana, Elisa V. and Barclay, Thomas and Suissa, Gabrielle and Kopparapu, Ravi kumar and Dressing, Courtney D. and Ricker, George R. and Vanderspek, Roland K. and Latham, David W. and Seager, Sara and Winn, Joshua N. and Jenkins, Jon M. and Berta-Thompson, Zachory and Boyd, Patricia T. and Charbonneau, David and Caldwell, Douglas A. and Chiang, Eugene and Christiansen, Jessie L. and Ciardi, David R. and Colon, Knicole D. and Doty, John and Gan, Tianjun and Guerrero, Natalia and Gunther, Maximilian N. and Lee, Eve J. and Levine, Alan M. and Lopez, Eric and Muirhead, Philip S. and Newton, Elisabeth and Rose, Mark E. and Twicken, Joseph D. and Villasenor, Jesus Noel (2020) The First Habitable-zone Earth-sized Planet from TESS. II. Spitzer Confirms TOI-700 d. The Astronomical Journal, 160 (3):117. pp. 1-12. ISSN 0004-6256

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Abstract

We present Spitzer 4.5 μm 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 1.144-0.061+0.062R⊕ and orbits within its host star's conservative habitable zone with a period of 37.42 days (T eq ∼ 269 K). TOI-700 also hosts two small inner planets (R b = 1.037-0.064+0.065R⊕and R c = 2.65-0.15+0.16R⊕) with periods of 9.98 and 16.05 days, respectively. Our Spitzer observations confirm the Transiting Exoplanet Survey Satellite (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. Although studying the atmosphere of TOI-700 d is not likely feasible with upcoming facilities, it may be possible to measure the mass of TOI-700 d using state-of-the-art radial velocity (RV) instruments (expected RV semiamplitude of ∼70 cm s-1).


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: Published version deposited in accordance with the copyright policy of the publisher.
Faculty/School / Institute/Centre: No Faculty
Faculty/School / Institute/Centre: No Faculty
Date Deposited: 03 Apr 2022 22:32
Last Modified: 19 May 2022 03:36
Uncontrolled Keywords: Exoplanets (498); Habitable planets (695); Habitable zone (696); Low mass stars (2050); Antarctic observatories (47); Exoplanet astronomy (486); Exoplanet detection methods (489); Exoplanet systems (484); Astrophysics - Earth and Planetary Astrophysics; Astrophysics - Instrumentation and Methods for Astrophysics; Astrophysics - Solar and Stellar Astrophysics
Fields of Research (2020): 51 PHYSICAL SCIENCES > 5101 Astronomical sciences > 510109 Stellar astronomy and planetary systems
Identification Number or DOI: https://doi.org/10.3847/1538-3881/aba4b3
URI: http://eprints.usq.edu.au/id/eprint/47394

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