Barragán, O;
Armstrong, DJ;
Gandolfi, D;
Carleo, I;
Vidotto, AA;
D’Angelo, C Villarreal;
Oklopčić, A;
... Ziegler, C; + view all
(2022)
The young HD 73583 (TOI-560) planetary system: Two 10-M_{⊕} mini-Neptunes transiting a 500-Myr-old, bright, and active K dwarf.
Monthly Notices of the Royal Astronomical Society
10.1093/mnras/stac638.
(In press).
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Abstract
We present the discovery and characterisation 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 characterise 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_{-0.0000062}^{+0.0000067} d) has a mass and radius of 10.2_{-3.1}^{+3.4} M_{⊕} and 2.79 ± 0.10 R_{⊕}, respectively, that gives a density of 2.58 _{ - 0.81 } ^ { + 0.95 }$ g cm−3. HD 73583 c (Pc=$18.87974 _{ - 0.00074 } ^ { + 0.00086 }$ d) has a mass and radius of 9.7_{-1.7}^{+ 1.8} M_{⊕} and 2.39_{-0.09}^{+0.10} R_{⊕}, respectively, this translates to a density of 3.88_{-0.80}^{+0.91} g cm^{−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 on-going 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.
| Type: | Article |
|---|---|
| Title: | The young HD 73583 (TOI-560) planetary system: Two 10-M_{⊕} mini-Neptunes transiting a 500-Myr-old, bright, and active K dwarf |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1093/mnras/stac638 |
| Publisher version: | http://dx.doi.org/10.1093/mnras/stac638 |
| Language: | English |
| Additional information: | © The Author(s) 2022. Published by Oxford University Press on behalf of The 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/). |
| Keywords: | Planets and satellites: individual: HD 73583 (TOI-560), Stars: activity, Techniques: photometric, Techniques: radial velocities |
| UCL classification: | UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Space and Climate Physics UCL > Provost and Vice Provost Offices > UCL BEAMS UCL |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10145732 |
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