Osborn, A, Armstrong, DJ, Cale, B, Brahm, R, Wittenmyer, RA, Dai, F, Crossfield, IJM, Bryant, EM, Adibekyan, V, Cloutier, R, Collins, KA, Mena, ED, Fridlund, M, Hellier, C, Howell, SB, King, GW, Lillo-Box, J, Otegi, J, Sousa, S, Stassun, KG, Matthews, EC, Ziegler, C, Ricker, G, Vanderspek, R, Latham, DW, Seager, S, Winn, JN, Jenkins, JM, Acton, JS, Addison, BC, Anderson, DR, Ballard, S, Barrado, D, Barros, SCC, Batalha, N, Bayliss, D, Barclay, T, Benneke, B, Berberian, J, Bouchy, F, Bowler, BP, Briceno, C, Burke, CJ, Burleigh, MR, Casewell, SL, Ciardi, D, Collins, KI, Cooke, BF, Demangeon, ODS, Diaz, RF, Dorn, C, Dragomir, D, Dressing, C, Dumusque, X, Espinoza, N, Figueira, P, Fulton, B, Furlan, E, Gaidos, E, Geneser, C, Gill, S, Goad, MR, Gonzales, EJ, Gorjian, V, Gunther, MN, Helled, R, Henderson, BA, Henning, T, Hogan, A, Hojjatpanah, S, Horner, J, Howard, AW, Hoyer, S, Huber, D, Isaacson, H, Jenkins, JS, Jensen, ELN, Jordan, A, Kane, SR, Jr, KRC, Kielkopf, J, Law, N, Lendl, M, Lund, M, Matson, RA, Mann, AW, McCormac, J, Mengel, MW, Morales, FY, Nielsen, LD, Okumura, J, Osborn, HP, Petigura, EA, Plavchan, P, Pollacco, D, Quintana, EV, Raynard, L, Robertson, P, Rose, ME, Roy, A, Reefe, M, Santerne, A, Santos, NC, Sarkis, P, Schlieder, J, Schwarz, RP, Scott, NJ, Shporer, A, Smith, AMS, Stibbard, C, Stockdale, C, Strom, PA, Twicken, JD, Tan, T-G, Tanner, A, Teske, J, Tilbrook, RH, Tinney, CG, Udry, S, Villasenor, JN, Vines, JI, Wang, SX, Weiss, LM, West, RG, Wheatley, PJ, Wright, DJ, Zhang, H and Zohrabi, F (2021) TOI-431/HIP 26013: a super-Earth and a sub-Neptune transiting a bright, early K dwarf, with a third RV planet. Monthly Notices of the Royal Astronomical Society, 507 (2). 2782 - 2803. ISSN 0035-8711

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Abstract

We present the bright (Vmag = 9.12), multiplanet system TOI-431, characterized with photometry and radial velocities (RVs). We estimate the stellar rotation period to be 30.5 ± 0.7 d using archival photometry and RVs. Transiting Exoplanet Survey Satellite (TESS) objects of Interest (TOI)-431 b is a super-Earth with a period of 0.49 d, a radius of 1.28 ± 0.04 R⊕, a mass of 3.07 ± 0.35 M⊕, and a density of 8.0 ± 1.0 g cm−3; TOI-431 d is a sub-Neptune with a period of 12.46 d, a radius of 3.29 ± 0.09 R⊕, a mass of 9.90+1.53−1.49 M⊕, and a density of 1.36 ± 0.25 g cm−3. We find a third planet, TOI-431 c, in the High Accuracy Radial velocity Planet Searcher RV data, but it is not seen to transit in the TESS light curves. It has an Msin i of 2.83+0.41−0.34 M⊕, and a period of 4.85 d. TOI-431 d likely has an extended atmosphere and is one of the most well-suited TESS discoveries for atmospheric characterization, while the super-Earth TOI-431 b may be a stripped core. These planets straddle the radius gap, presenting an interesting case-study for atmospheric evolution, and TOI-431 b is a prime TESS discovery for the study of rocky planet phase curves.

Item Type: Article
Additional Information: © 2021 The Author(s) Published by Oxford University Press on behalf of Royal Astronomical Society This article is published and distributed under the terms of the Oxford University Press, Standard Journals Publication Model (https://academic.oup.com/journals/pages/open_access/funder_policies/chorus/standard_publication_model)
Subjects: Q Science > Q Science (General)
Q Science > QB Astronomy
Q Science > QB Astronomy > QB460 Astrophysics
Q Science > QB Astronomy > QB600 Planets. Planetology
Q Science > QC Physics
Divisions: Faculty of Natural Sciences > School of Chemical and Physical Sciences
Related URLs:
Depositing User: Symplectic
Date Deposited: 19 Jan 2022 10:45
Last Modified: 19 Jan 2022 10:45
URI: https://eprints.keele.ac.uk/id/eprint/10512

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