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Barragan, O, Armstrong, DJ, Gandolfi, D, Carleo, I, Vidotto, AA, D'Angelo, CV, Oklopcic, A, Isaacson, H, Oddo, D, Collins, K, Fridlund, M, Sousa, SG, Persson, CM, Hellier, C, Howell, S, Howard, A, Redfield, S, Eisner, N, Georgieva, IY, Dragomir, D, Bayliss, D, Nielsen, LD, Klein, B, Aigrain, S, Zhang, M, Teske, J, Twicken, JD, Jenkins, J, Esposito, M, Van Eylen, V, Rodler, F, Adibekyan, V, Alarcon, J, Anderson, DR, Murphy, JMA, Barrado, D, Barros, SCC, Benneke, B, Bouchy, F, Bryant, EM, Butler, RP, Burt, J, Cabrera, J, Casewell, S, Chaturvedi, P, Cloutier, R, Cochran, WD, Crane, J, Crossfield, I, Crouzet, N, Collins, KI, Dai, F, Deeg, HJ, Deline, A, Demangeon, ODS, Dumusque, X, Figueira, P, Furlan, E, Gnilka, C, Goad, MR, Goffo, E, Gutierrez-Canales, F, Hadjigeorghiou, A, Hartman, Z, Hatzes, AP, Harris, M, Henderson, B, Hirano, T, Hojjatpanah, S, Hoyer, S, Kabath, P, Korth, J, Lillo-Box, J, Luque, R, Marmier, M, Mocnik, T, Muresan, A, Murgas, F, Nagel, E, Osborne, HLM, Osborn, A, Osborn, HP, Palle, E, Raimbault, M, Ricker, GR, Rubenzahl, RA, Stockdale, C, Santos, NC, Scott, N, Schwarz, RP, Shectman, S, Seager, S, Segransan, D, Serrano, LM, Skarka, M, Smith, AMS, Subjak, J, Tan, TG, Udry, S, Watson, C, Wheatley, PJ, West, R, Winn, JN, Wang, SX, Wolfgang, A and Ziegler, C (2022) The young HD 73583 (TOI-560) planetary system: two 10-M-circle plus mini-Neptunes transiting a 500-Myr-old, bright, and active K dwarf. Monthly Notices of the Royal Astronomical Society, 514 (2). 1606 - 1627. ISSN 0035-8711

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Abstract

We present the discovery and characterization of two transiting planets observed by TESS in the light curves of the young and bright (V = 9.67) star HD73583 (TOI-560). We perform an intensive spectroscopic and photometric space- and ground-based follow-up in order to confirm and characterize the system. We found that HD73583 is a young (∼500 Myr) active star with a rotational period of 12.08 ± 0.11  d, and a mass and radius of 0.73 ± 0.02 M⊙ and 0.65 ± 0.02 R⊙, respectively. HD 73583 b (Pb = 6.3980420+0.0000067−0.0000062 d) has a mass and radius of 10.2+3.4−3.1 M⊕ and 2.79 ± 0.10 R⊕, respectively, which gives a density of 2.58+0.95−0.81 gcm−3⁠. HD 73583 c (Pc = 18.87974+0.00086−0.00074 d) has a mass and radius of 9.7+1.8−1.7 M⊕ and 2.39+0.10−0.09 R⊕, respectively, which translates to a density of 3.88+0.91−0.80 gcm−3⁠. Both planets are consistent with worlds made of a solid core surrounded by a volatile envelope. Because of their youth and host star brightness, they both are excellent candidates to perform transmission spectroscopy studies. We expect ongoing atmospheric mass-loss for both planets caused by stellar irradiation. We estimate that the detection of evaporating signatures on H and He would be challenging, but doable with present and future instruments.

Item Type: Article
Additional Information: © The Author(s) 2022. Published by Oxford University Press on behalf of Royal Astronomical Society This is an Open Access article distributed under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0/), which permits unrestricted reuse, distribution, and reproduction in any medium, provided the original work is properly cited.
Uncontrolled Keywords: techniques: photometric, techniques: radial velocities, planets and satellites: individual: HD 73583 (TOI-560), stars: activity
Subjects: Q Science > Q Science (General)
Q Science > QB Astronomy
Divisions: Faculty of Natural Sciences > School of Chemical and Physical Sciences
Related URLs:
Depositing User: Symplectic
Date Deposited: 09 Aug 2022 08:45
Last Modified: 09 Aug 2022 08:45
URI: https://eprints.keele.ac.uk/id/eprint/11218

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