2022MNRAS.511.4551L

Query : 2022MNRAS.511.4551L

2022MNRAS.511.4551L - Mon. Not. R. Astron. Soc., 511, 4551-4571 (2022/April-2)

Investigating the architecture and internal structure of the TOI-561 system planets with CHEOPS, HARPS-N, and TESS.

LACEDELLI G., WILSON T.G., MALAVOLTA L., HOOTON M.J., COLLIER CAMERON A., ALIBERT Y., MORTIER A., BONFANTI A., HAYWOOD R.D., HOYER S., PIOTTO G., BEKKELIEN A., VANDERBURG A.M., BENZ W., DUMUSQUE X., DELINE A., LOPEZ-MORALES M., BORSATO L., RICE K., FOSSATI L., LATHAM D.W., BRANDEKER A., PORETTI E., SOUSA S.G., SOZZETTI A., SALMON S., BURKE C.J., VAN GROOTEL V., FAUSNAUGH M.M., ADIBEKYAN V., HUANG C.X., OSBORN H.P., MUSTILL A.J., PALLE E., BOURRIER V., NASCIMBENI V., ALONSO R., ANGLADA G., BARCZY T., BARRADO Y NAVASCUES D., BARROS S.C.C., BAUMJOHANN W., BECK M., BECK T., BILLOT N., BONFILS X., BROEG C., BUCHHAVE L.A., CABRERA J., CHARNOZ S., COSENTINO R., CSIZMADIA S., DAVIES M.B., DELEUIL M., DELREZ L., DEMANGEON O., DEMORY B.-O., EHRENREICH D., ERIKSON A., ESPARZA-BORGES E., FLOREN H.G., FORTIER A., FRIDLUND M., FUTYAN D., GANDOLFI D., GHEDINA A., GILLON M., GUDEL M., GUTERMAN P., HARUTYUNYAN A., HENG K., ISAAK K.G., JENKINS J.M., KISS L., LASKAR J., LECAVELIER DES ETANGS A., LENDL M., LOVIS C., MAGRIN D., MARAFATTO L., MARTINEZ FIORENZANO A.F., MAXTED P.F.L., MAYOR M., MICELA G., MOLINARI E., MURGAS F., NARITA N., OLOFSSON G., OTTENSAMER R., PAGANO I., PASETTI A., PEDANI M., PEPE F.A., PETER G., PHILLIPS D.F., POLLACCO D., QUELOZ D., RAGAZZONI R., RANDO N., RATTI F., RAUER H., RIBAS I., SANTOS N.C., SASSELOV D., SCANDARIATO G., SEAGER S., SEGRANSAN D., SERRANO L.M., SIMON A.E., SMITH A.M.S., STEINBERGER M., STELLER M., SZABO G., THOMAS N., TWICKEN J.D., UDRY S., WALTON N. and WINN J.N.

Abstract (from CDS):

We present a precise characterization of the TOI-561 planetary system obtained by combining previously published data with TESS and CHEOPS photometry, and a new set of 62 HARPS-N radial velocities (RVs). Our joint analysis confirms the presence of four transiting planets, namely TOI-561 b (P = 0.45 d, R = 1.42 R⊕, M = 2.0 M⊕), c (P = 10.78 d, R = 2.91 R⊕, M = 5.4 M⊕), d (P = 25.7 d, R = 2.82 R⊕, M = 13.2 M⊕), and e (P = 77 d, R = 2.55 R⊕, M = 12.6 R⊕). Moreover, we identify an additional, long-period signal (>450 d) in the RVs, which could be due to either an external planetary companion or to stellar magnetic activity. The precise masses and radii obtained for the four planets allowed us to conduct interior structure and atmospheric escape modelling. TOI-561 b is confirmed to be the lowest density (ρb = 3.8 ± 0.5 g cm–3) ultra-short period (USP) planet known to date, and the low metallicity of the host star makes it consistent with the general bulk density-stellar metallicity trend. According to our interior structure modelling, planet b has basically no gas envelope, and it could host a certain amount of water. In contrast, TOI-561 c, d, and e likely retained an H/He envelope, in addition to a possibly large water layer. The inferred planetary compositions suggest different atmospheric evolutionary paths, with planets b and c having experienced significant gas loss, and planets d and e showing an atmospheric content consistent with the original one. The uniqueness of the USP planet, the presence of the long-period planet TOI-561 e, and the complex architecture make this system an appealing target for follow-up studies.

Abstract Copyright: © 2022 The Author(s) Published by Oxford University Press on behalf of Royal Astronomical Society

Journal keyword(s): techniques: photometric - techniques: radial velocities - planets and satellites: fundamental parameters - planets and satellites: interiors - stars: individual: (TOI-561 (TIC 377064495, Gaia EDR3 3850421005290172416))

VizieR on-line data: <Available at CDS (J/MNRAS/511/4551): v1-det.dat v1-raw.dat v2-det.dat v2-raw.dat v3-det.dat v3-raw.dat table5.dat>

Simbad objects: 11

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Number of rows : 11
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 Cl Melotte 22 OpC 03 46 38.0 +24 10 41           ~ 3679 0
2 NGC 2168 OpC 06 09 07.5 +24 20 15           ~ 604 0
3 NGC 2323 OpC 07 02 47.3 -08 22 07           ~ 212 0
4 NGC 2516 OpC 07 58 00.5 -60 46 36           ~ 793 0
5 TOI-561f Pl 09 52 44.5491687624 +06 12 58.920960204           ~ 5 0
6 TOI-561c Pl 09 52 44.5491687624 +06 12 58.920960204           ~ 28 0
7 TOI-561e Pl 09 52 44.5491687624 +06 12 58.920960204           ~ 12 0
8 TOI-561 MS* 09 52 44.5491687624 +06 12 58.920960204   10.909 10.243 10.065   ~ 65 0
9 TOI-561b Pl 09 52 44.5491687624 +06 12 58.920960204           ~ 61 0
10 TOI-561d Pl 09 52 44.5491687624 +06 12 58.920960204           ~ 21 0
11 CD-47 13059 PM* 19 44 00.9498094224 -47 33 41.746168584   12.030 10.954 10.729 10.01 ~ 23 0

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