2023A&A...680A..76M

Query : 2023A&A...680A..76M

2023A&A...680A..76M - Astronomy and Astrophysics, volume 680A76 (2023/12-1)

TOI-1801 b: A temperate mini-Neptune around a young M0.5 dwarf.

MALLORQUIN M., GOFFO E., PALLE E., LODIEU N., BEJAR V.J.S., ISAACSON H., ZAPATERO OSORIO M.R., DREIZLER S., STOCK S., LUQUE R., MURGAS F., PENA L., SANZ-FORCADA J., MORELLO G., CIARDI D.R., FURLAN E., COLLINS K.A., HERRERO E., VANAVERBEKE S., PLAVCHAN P., NARITA N., SCHWEITZER A., PEREZ-TORRES M., QUIRRENBACH A., KEMMER J., HATZES A.P., HOWARD A., SCHLECKER M., REFFERT S., NAGEL E., MORALES J.C., ORELL-MIQUEL J., DUQUE-ARRIBAS C., CARLEO I., CIFUENTES C., NOWAK G., RIBAS I., REINERS A., AMADO P.J., CABALLERO J.A., HENNING T., PINTER V., MURPHY J.M.A., BEARD C., BLUNT S., BRINKMAN C.L., CALE B., CHONTOS A., COLLINS K.I., CROSSFIELD I.J.M., DAI F., DALBA P.A., DUFOER S., EL MUFTI M., ESPINOZA N., FETHEROLF T., FUKUI A., GIACALONE S., GNILKA C., GONZALES E., GRUNBLATT S.K., HOWELL S., HUBER D., KANE S.R., DE LEON J.P., LUBIN J., MacDOUGALL M.G., MASSEY B., MONTES D., MORI M., PARVIAINEN H., PASSEGGER V.M., POLANSKI A.S., ROBERTSON P., SCHWARZ R.P., SRDOC G., TABERNERO H.M., TANNER A., TURTELBOOM E., VAN ZANDT J., WEISS L. and ZECHMEISTER M.

Abstract (from CDS):

We report the discovery, mass, and radius determination of TOI-1801 b, a temperate mini-Neptune around a young M dwarf. TOI-1801 b was observed in TESS sectors 22 and 49, and the alert that this was a TESS planet candidate with a period of 21.3 days went out in April 2020. However, ground-based follow-up observations, including seeing-limited photometry in and outside transit together with precise radial velocity (RV) measurements with CARMENES and HIRES revealed that the true period of the planet is 10.6 days. These observations also allowed us to retrieve a mass of 5.74 ± 1.46 M⊕, which together with a radius of 2.08 ± 0.12 R⊕, means that TOI-1801 b is most probably composed of water and rock, with an upper limit of 2% by mass of H2 in its atmosphere. The stellar rotation period of 16 days is readily detectable in our RV time series and in the ground-based photometry. We derived a likely age of 600-800 Myr for the parent star TOI-1801, which means that TOI-1801 b is the least massive young mini-Neptune with precise mass and radius determinations. Our results suggest that if TOI-1801 b had a larger atmosphere in the past, it must have been removed by some evolutionary mechanism on timescales shorter than 1 Gyr.

Abstract Copyright: © The Authors 2023

Journal keyword(s): planetary systems - planets and satellites: individual: TOI-1801 - planets and satellites: atmospheres - techniques: spectroscopic - techniques: radial velocities - stars: low-mass

Simbad objects: 51

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Number of rows : 51
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 NAME PM J02489-1432Wb Pl 02 48 59.2728446101 -14 32 14.942011299           ~ 22 0
2 HD 18599b Pl 02 57 02.9515683384 -56 11 31.513386300           ~ 14 0
3 Cl Melotte 22 OpC 03 46 38.0 +24 10 41           ~ 3679 0
4 K2-25b Pl 04 13 05.6131374072 +15 14 52.018080576           ~ 108 0
5 HD 283636b Pl 04 23 55.1350544280 +27 49 21.167484708           ~ 25 0
6 K2-136c Pl 04 29 38.9939167752 +22 52 57.793533924           ~ 35 0
7 K2-136d Pl 04 29 38.9939167752 +22 52 57.793533924           ~ 24 0
8 K2-136b Pl 04 29 38.9939167752 +22 52 57.793533924           ~ 25 0
9 Cl Melotte 25 OpC 04 30 27.4 +16 46 43           ~ 3309 0
10 NAME UPM J0505-4756b Pl 05 05 14.4284259960 -47 56 15.526276908           ~ 25 0
11 K2-284b Pl 05 16 33.7635876744 +20 15 18.365704668           ~ 12 0
12 V* AB Dor TT* 05 28 44.8712165880 -65 26 55.199147208 8.259 7.856 6.999 6.496 5.993 K0V 1080 0
13 TOI-712c Pl 06 11 44.6726228160 -65 49 33.498955992           ~ 3 0
14 TOI-712b Pl 06 11 44.6726228160 -65 49 33.498955992           ~ 4 0
15 TOI-712d Pl 06 11 44.6726228160 -65 49 33.498955992           ~ 4 0
16 HD 63433c Pl 07 49 55.0606576176 +27 21 47.457467316           ~ 65 0
17 K2-95b Pl 08 37 27.0563032536 +18 58 36.021202824           ~ 41 0
18 K2-100b Pl 08 38 24.3002838928 +20 06 21.828057218           ~ 83 0
19 K2-104b Pl 08 38 32.8359046503 +19 46 25.591543965           ~ 28 0
20 HD 73583b Pl 08 38 45.2603894280 -13 15 24.092462772           ~ 57 0
21 HD 73583c Pl 08 38 45.2603894280 -13 15 24.092462772           ~ 21 0
22 NGC 2632 OpC 08 39 58.4 +19 36 33           ~ 1733 0
23 K2-102b Pl 08 40 13.4534275080 +19 46 43.709186244           ~ 19 0
24 K2-103b Pl 08 41 38.4893118114 +17 38 24.084971669           ~ 23 0
25 K2-264c Pl 08 45 26.0457995394 +19 41 54.446989270           ~ 18 0
26 LP 375-23 MS* 11 42 18.3739352064 +23 01 36.672243672   12.46 11.41 11.146   M0.5V 53 0
27 NAME LP 375-23b Pl 11 42 18.3739352064 +23 01 36.672243672           ~ 14 0
28 LP 375-24 PM* 11 42 21.2207198976 +23 03 14.086018836   16.05 14.47 14.18   M4V 16 0
29 NAME Ursa Major Moving Group MGr 12 32 +57.0           ~ 467 1
30 MELANGE-1 As* 12 50 22.0 -88 07 15           ~ 12 0
31 NAME NGP reg 12 51 26.275 +27 07 41.70           ~ 1274 0
32 BD+39 2643b Pl 13 25 07.9957316160 +38 55 20.944920864           ~ 41 0
33 NAME beta Pic Moving Group MGr 14 30 -42.0           ~ 894 0
34 BD-19 4086d Pl 15 21 55.1983073496 -20 13 53.990924232           ~ 13 0
35 G 180-52 PM* 16 23 04.8890218680 +36 50 31.490910672       10.2   K3 22 1
36 NAME Galactic Center reg 17 45 39.60213 -29 00 22.0000           ~ 16269 0
37 NAME Hercules Cloud MoC 18 40 +14.3           ~ 13 0
38 NAME del Lyr Cluster OpC 18 54 11.2 +36 53 54   4.58 3.8     ~ 97 0
39 Kepler-1975b Pl 19 06 59.6424598464 +45 09 31.388510592           ~ 6 0
40 MELANGE-3 As* 19 18 30.0 +40 42 31           ~ 8 0
41 Kepler-970b Pl 19 18 30.0563509272 +40 42 31.420919736           ~ 20 0
42 NGC 6811 OpC 19 37 21.8 +46 22 43   7.47 6.8     ~ 435 0
43 HD 197481b Pl 20 45 09.5324974119 -31 20 27.237889841           ~ 158 0
44 HD 197481c Pl 20 45 09.5324974119 -31 20 27.237889841           ~ 82 0
45 HD 207496b Pl 21 54 51.3012959280 -77 20 16.794764484           ~ 11 0
46 NAME Cepheus Cloud SFR 22 00.0 +76 30           ~ 165 0
47 * 51 Peg b Pl 22 57 27.9804852576 +20 46 07.797040104           ~ 744 1
48 NAME IC 2391 Supercluster MGr ~ ~           ~ 20 0
49 NAME Castor Moving Group As* ~ ~           ~ 140 1
50 NAME Pleiades Moving Group MGr ~ ~           ~ 297 0
51 NAME Psc-Eri Stream St* ~ ~           ~ 70 0

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