2023A&A...671A.163M


Query : 2023A&A...671A.163M

2023A&A...671A.163M - Astronomy and Astrophysics, volume 671A, 163 (2023/3-1)

Dynamical masses of two young transiting sub-Neptunes orbiting HD 63433.

MALLORQUIN M., BEJAR V.J.S., LODIEU N., ZAPATERO OSORIO M.R., TABERNERO H., SUAREZ MASCARENO A., ZECHMEISTER M., LUQUE R., PALLE E. and MONTES D.

Abstract (from CDS):

Context. Although the number of exoplanets reported in the literature exceeds 5000 so far, only a few dozen of them are young planets (≤900 Myr). However, a complete characterization of these young planets is key to understanding the current properties of the entire population. Hence, it is necessary to constrain the planetary formation processes and the timescales of dynamical evolution by measuring the masses of exoplanets transiting young stars.
Aims. We characterize and measure the masses of two transiting planets orbiting the 400 Myr old solar-type star HD 63433, which is a member of the Ursa Major moving group.
Methods. We analysed precise photometric light curves of five sectors of the TESS mission with a baseline of ∼750 days and obtained ∼150 precise radial velocity measurements with the visible and infrared arms of the CARMENES instrument at the Calar Alto 3.5 m telescope in two different campaigns of ∼500 days. We performed a combined photometric and spectroscopic analysis to retrieve the planetary properties of two young planets. The strong stellar activity signal was modelled by Gaussian regression processes. Results. We have updated the transit parameters of HD 63433 b and c and obtained planet radii of Rpb = 2.140 ± 0.087 R and Rpc = 2.692 ± 0.108 R. Our analysis allowed us to determine the dynamical mass of the outer planet with a 4σ significance (Mpc = 15.54 ± 3.86 M) and set an upper limit on the mass of the inner planet at 3σ (Mpb < 21.76 M). According to theoretical models, both planets are expected to be sub-Neptunes, whose interiors mostly consist of silicates and water with no dominant composition of iron, and whose gas envelopes are lower than 2% in the case of HD 63433 c. The envelope is unconstrained in HD 63433 b.

Abstract Copyright: © The Authors 2023

Journal keyword(s): planetary systems - planets and satellites: fundamental parameters - techniques: radial velocities - techniques: photometric - stars: activity - stars: solar-type

Status at CDS : Examining the need for a new acronym.

Simbad objects: 20

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Number of rows : 20
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024
#notes
1 NAME PM J02489-1432Wb Pl 02 48 59.2728446101 -14 32 14.942011299           ~ 14 0
2 K2-25b Pl 04 13 05.6131374072 +15 14 52.018080576           ~ 79 0
3 Cl Melotte 25 OpC 04 29 47.3 +16 56 53           ~ 3082 0
4 NAME AB Dor Moving Group MGr 06 38 53.4 -42 50 04           ~ 472 0
5 HD 63433b Pl 07 49 55.0606576176 +27 21 47.457467316           ~ 41 0
6 HD 63433c Pl 07 49 55.0606576176 +27 21 47.457467316           ~ 39 0
7 HD 63433 BY* 07 49 55.0606576176 +27 21 47.457467316   7.59 6.91     G5V 157 0
8 K2-100b Pl 08 38 24.3002838928 +20 06 21.828057218           ~ 67 0
9 HD 73583b Pl 08 38 45.2603894280 -13 15 24.092462772           ~ 30 0
10 NGC 2632 OpC 08 40 13.0 +19 37 16           ~ 1567 0
11 NAME Ursa Major Moving Group MGr 12 32 +57.0           ~ 439 2
12 NAME MELANGE-1 As* 12 50 22.0 -88 07 15           ~ 11 0
13 BD+39 2643b Pl 13 25 07.9957316160 +38 55 20.944920864           ~ 24 0
14 BD+39 2643 PM* 13 25 07.9957316160 +38 55 20.944920864   11.131 10.257 9.736   K3V 34 0
15 NAME beta Pic Moving Group MGr 14 30 -42.0           ~ 777 0
16 NAME Upper Sco Association As* 16 12 -23.4           ~ 1369 1
17 NAME del Lyr Cluster OpC 18 54 16.3 +36 53 56   4.58 3.8     ~ 80 0
18 HD 197481c Pl? 20 45 09.5324974119 -31 20 27.237889841           ~ 51 0
19 HD 197481b Pl? 20 45 09.5324974119 -31 20 27.237889841           ~ 107 0
20 NAME Psc-Eri Stream St* ~ ~           ~ 49 0

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