2022A&A...663A..48Q


Query : 2022A&A...663A..48Q

2022A&A...663A..48Q - Astronomy and Astrophysics, volume 663A, 48-48 (2022/7-1)

The CARMENES search for exoplanets around M dwarfs. Two Saturn-mass planets orbiting active stars.

QUIRRENBACH A., PASSEGGER V.M., TRIFONOV T., AMADO P.J., CABALLERO J.A., REINERS A., RIBAS I., ACEITUNO J., BEJAR V.J.S., CHATURVEDI P., GONZALEZ-CUESTA L., HENNING T., HERRERO E., KAMINSKI A., KURSTER M., LALITHA S., LODIEU N., LOPEZ-GONZALEZ M.J., MONTES D., PALLE E., PERGER M., POLLACCO D., REFFERT S., RODRIGUEZ E., LOPEZ C.R., SHAN Y., TAL-OR L., ZAPATERO OSORIO M.R. and ZECHMEISTER M.

Abstract (from CDS):

The CARMENES radial-velocity survey is currently searching for planets in a sample of 387 M dwarfs. Here we report on two Saturn-mass planets orbiting TYC 2187-512-1 (M* = 0.50 M) and TZ Ari (M* = 0.15 M), respectively. We obtained supplementary photometric time series, which we use along with spectroscopic information to determine the rotation periods of the two stars. In both cases, the radial velocities also show strong modulations at the respective rotation period. We thus modeled the radial velocities as a Keplerian orbit plus a Gaussian process representing the stellar variability. TYC 2187-512-1 is found to harbor a planet with a minimum mass of 0.33 MJup in a near-circular 692-day orbit. The companion of TZ Ari has a minimum mass of 0.21 MJup, orbital period of 771 d, and orbital eccentricity of 0.46. We provide an overview of all known giant planets in the CARMENES sample, from which we infer an occurrence rate of giant planets orbiting M dwarfs with periods up to 2 yr in the range between 2 and 6%. TZ Ari b is only the second giant planet discovered orbiting a host with mass less than 0.3 M. These objects occupy an extreme location in the planet mass versus host mass plane. It is difficult to explain their formation in core-accretion scenarios, so they may possibly have been formed through a disk fragmentation process.

Abstract Copyright: © ESO 2022

Journal keyword(s): planets and satellites: detection - planets and satellites: formation - stars: individual: TZ Ari - stars: individual: TYC 2187-512-1 - stars: low-mass - techniques: radial velocities

VizieR on-line data: <Available at CDS (J/A+A/663/A48): tyc-vis.dat tyc-nid.dat tz-vis.dat tz-nir.dat>

Simbad objects: 23

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Number of rows : 23
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 HD 1326c Pl 00 18 22.8849799680 +44 01 22.637951588           ~ 12 0
2 HATS-71b Pl 01 02 12.2806419528 -61 45 21.661597188           ~ 25 0
3 GJ 9066 b Pl? 02 00 12.9563198327 +13 03 07.000569241           ~ 6 0
4 V* TZ Ari Er* 02 00 12.9563198327 +13 03 07.000569241 15.406 14.100 12.298 10.943 9.195 M4.5V 280 0
5 NAME Teegarden's Star LM* 02 53 00.8917932409 +16 52 52.632190137   17.21   14.1   dM6 157 0
6 Cl Melotte 25 OpC 04 29 47.3 +16 56 53           ~ 3071 0
7 Wolf 1539b Pl 04 52 05.7321216445 +06 28 35.588676189           ~ 29 1
8 NAME G 234-45c Pl? 08 41 20.1286588424 +59 29 50.444062516           ~ 7 0
9 NAME G 234-45b Pl 08 41 20.1286588424 +59 29 50.444062516           ~ 27 0
10 G 234-45 PM* 08 41 20.1286588424 +59 29 50.444062516   16.98   14.1   dM5.5 79 0
11 V* LQ Hya BY* 09 32 25.5683895648 -11 11 04.692242760 9.316 8.761 7.891 7.288 6.815 K1Vp 457 0
12 Ross 1003c Pl 11 41 44.6358403057 +42 45 07.102117090           ~ 10 0
13 Ross 1003b Pl 11 41 44.6358403057 +42 45 07.102117090           ~ 29 1
14 BD+25 3173b Pl 16 58 08.8496107083 +25 44 38.974052855           ~ 30 1
15 * nu. Oph PM* 17 59 01.5922136612 -09 46 25.080976810 5.20 4.33 3.34 2.64 2.16 G9IIIa 212 1
16 LSPM J2122+2255 PM* 21 22 06.2818617504 +22 55 53.140308708       10.067   M1.0V 34 0
17 NAME TYC 2187-512-1b Pl? 21 22 06.2818617504 +22 55 53.140308708           ~ 2 0
18 V* V374 Peg Er* 22 01 13.1241989539 +28 18 24.907312662       11.602   M3.5Ve 223 0
19 BD-05 5715b Pl 22 09 40.3443137051 -04 38 26.650757960           ~ 48 1
20 BD-05 5715c Pl 22 09 40.3443137051 -04 38 26.650757960           ~ 10 0
21 BD-15 6290c Pl 22 53 16.7325836486 -14 15 49.304052185           ~ 195 1
22 BD-15 6290b Pl 22 53 16.7325836486 -14 15 49.304052185           ~ 252 1
23 TRAPPIST-1 LM* 23 06 29.3684948589 -05 02 29.037301866     18.798 16.466 14.024 M7.5e 992 0

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