Vach, S, Quinn, SN, Vanderburg, A, Kane, SR, Collins, KA, Kraus, AL, Zhou, G, Medina, AA, Schwarz, RP, Collins, KI, Conti, DM, Stockdale, C, Massey, B, Suarez, O, Guillot, T, Mekarnia, D, Abe, L, Dransfield, G, Crouzet, N, Triaud, AHMJ, Schmider, F-X, Agabi, A, Buttu, M, Hellier, C, Furlan, E, Gnilka, CL, Howell, SB, Ziegler, C, Briceno, C, Law, N, Mann, AW, Rudat, A, Colon, KD, Rose, ME, Kunimoto, M, Gunther, MN, Charbonneau, D, Ciardi, DR, Ricker, GR, Vanderspek, RK, Latham, DW, Seager, S, Winn, JN and Jenkins, JM (2022) TOI-712: A System of Adolescent Mini-Neptunes Extending to the Habitable Zone. Astronomical Journal, 164 (2). ISSN 0004-6256

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As an all-sky survey, NASA's Transiting Exoplanet Survey Satellite (TESS) mission is able to detect the brightest and rarest types of transiting planetary systems, including young planets that enable study of the evolutionary processes that occur within the first billion years. Here we report the discovery of a young, multiplanet system orbiting the bright K4.5V star, TOI-712 (V = 10.838, ${M}_{\star }={0.733}_{-0.025}^{+0.026}\,{M}_{\odot }$, R⋆ = 0.674 ± 0.016 R⊙, ${T}_{\mathrm{eff}}={4622}_{-60}^{+61}$ K). From the TESS light curve, we measure a rotation period of 12.48 days and derive an age between about 500 Myr and 1.1 Gyr. The photometric observations reveal three transiting mini-Neptunes (${R}_{b}={2.049}_{-0.080}^{+0.120}\,{R}_{\oplus }$, ${R}_{c}={2.701}_{-0.082}^{+0.092}\,{R}_{\oplus }$, ${R}_{d}={2.474}_{-0.082}^{+0.090}\,{R}_{\oplus }$), with orbital periods of Pb = 9.531 days, Pc = 51.699 days, and Pd = 84.839 days. After modeling the three-planet system, an additional Earth-sized candidate is identified, TOI-712.05 (P = 4.32 days, RP = 0.81 ± 0.11 R⊕). We calculate that the habitable zone falls between 0.339 and 0.844 au (82.7 and 325.3 days), placing TOI-712 d near its inner edge. Among planetary systems harboring temperate planets, TOI-712 (T = 9.9) stands out as a relatively young star bright enough to motivate further characterization.

Item Type: Article
Additional Information: Original content from this work may be used under the terms of the Creative Commons Attribution 4.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.
Uncontrolled Keywords: Exoplanets; Mini Neptunes; Exoplanet evolution; Exoplanet formation; Transits; Transit photometry; Exoplanet dynamics; Exoplanet systems
Subjects: Q Science > Q Science (General)
Q Science > QA Mathematics
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: 13 Sep 2022 15:11
Last Modified: 13 Sep 2022 15:11

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