The young HD 73583 (TOI-560) planetary system: two 10-M⊕ mini-Neptunes transiting a 500-Myr-old, bright, and active K dwarf

• Authors: BARRAGÁN O.; ARMSTRONG D. J.; GANDOLFI D.; CARLEO I.; VIDOTTO A. A.; D’ANGELO VILLARREAL C.; OKLOPČIĆ A.; ISAACSON H.; ODDO D.; COLLINS K.; FRIDLUND M.; SOUSA S. G.; PERSSON C. M.; HELLIER C.; HOWELL S.; HOWARD A.; REDFIELD S.; EISNER N.; GEORGIEVA I. Y.; DRAGOMIR D.; BAYLISS D.; NIELSEN L. D.; KLEIN B.; AIGRAIN S.; ZHANG M.; TESKE J.; TWICKEN J. D.; JENKINS J.; ESPOSITO M.; VAN EYLEN V.; RODLER F.; ADIBEKYAN V.; ALARCON J.; ANDERSON D. R.; AKANA MURPHY J. M.; BARRADO D.; BARROS S. C. C.; BENNEKE B.; BOUCHY F.; BRYANT E. M.; BUTLER R. P.; BURT J.; CABRERA J.; CASEWELL S.; CHATURVEDI P.; CLOUTIER R.; COCHRAN W. D.; CRANE J.; CROSSFIELD I.; CROUZET N.; COLLINS K. I.; DAI F.; DEEG H. J.; DELINE A.; DEMANGEON O. D. S.; DUMUSQUE X.; FIGUEIRA P.; FURLAN E.; GNILKA C.; GOAD M. R.; GOFFO E.; GUTIÉRREZ-CANALES F.; HADJIGEORGHIOU A.; HARTMAN Z.; HATZES A. P.; HARRIS M.; HENDERSON B.; HIRANO T.; HOJJATPANAH S.; HOYER S.; KABÁTH P.; KORTH J.; LILLO-BOX J.; LUQUE R.; MARMIER M.; MOČNIK T.; MURESAN A.; MURGAS F.; NAGEL E.; OSBORNE H. L. M.; OSBORN A.; OSBORN H. P.; PALLE E.; RAIMBAULT M.; RICKER G. R.; RUBENZAHL R. A.; STOCKDALE C.; SANTOS N. C.; SCOTT N.; SCHWARZ R. P.; SHECTMAN S.; RAIMBAULT M.; SEAGER S.; SÉGRANSAN D.; SERRANO L. M.; SKARKA Marek; SMITH A. M. S.; ŠUBJAK J.; TAN T. G.; UDRY S.; WATSON C.; WHEATLEY P. J.; WEST R.; WINN J. N.; WANG S. X.; WOLFGANG A.; ZIEGLER C.
• Year of publication: 2022
• Type: Article in Periodical
• Magazine / Source: Monthly Notices of the Royal Astronomical Society
• MU Faculty or unit: Faculty of Science

web

• https://academic.oup.com/mnras/article/514/2/1606/6548902
• https://arxiv.org/pdf/2110.13069.pdf

• Doi: http://dx.doi.org/10.1093/mnras/stac638
• Keywords: techniques: photometric; techniques: radial velocities; planets and satellites: individual: HD 73583 (TOI-560); stars: activity
• Description: 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 (similar to 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-circle dot and 0.65 +/- 0.02 R-circle dot, respectively. HD 73583 b (P-b = 6.3980420(-0.0000062)(+0.0000067 )d) has a mass and radius of 10.2(-3.1)(+3.4) M-circle plus and 2.79 +/- 0.10 R-circle plus, respectively, which gives a density of 2.58(-0.81)(+0.95) g cm(-3). HD 73583 c (P-c = 18.87974(-0.00074)(+0.00086) d) has a mass and radius of 9.7(-1.7)(+1.8) M-circle plus and 2.39(-0.09)(+0.10) R-circle plus, respectively, which 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 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.