2022A&A...659A..17K

Query : 2022A&A...659A..17K

2022A&A...659A..17K - Astronomy and Astrophysics, volume 659A, 17-17 (2022/3-1)

Discovery and mass measurement of the hot, transiting, Earth-sized planet, GJ 3929 b.

KEMMER J., DREIZLER S., KOSSAKOWSKI D., STOCK S., QUIRRENBACH A., CABALLERO J.A., AMADO P.J., COLLINS K.A., ESPINOZA N., HERRERO E., JENKINS J.M., LATHAM D.W., LILLO-BOX J., NARITA N., PALLE E., REINERS A., RIBAS I., RICKER G., RODRIGUEZ E., SEAGER S., VANDERSPEK R., WELLS R., WINN J., ACEITUNO F.J., BEJAR V.J.S., BARCLAY T., BLUHM P., CHATURVEDI P., CIFUENTES C., COLLINS K.I., CORTES-CONTRERAS M., DEMORY B.-O., FAUSNAUGH M.M., FUKUI A., GOMEZ MAQUEO CHEW Y., GALADI-ENRIQUEZ D., GAN T., GILLON M., GOLOVIN A., HATZES A.P., HENNING T., HUANG C., JEFFERS S.V., KAMINSKI A., KUNIMOTO M., KURSTER M., LOPEZ-GONZALEZ M.J., LAFARGA M., LUQUE R., McCORMAC J., MOLAVERDIKHANI K., MONTES D., MORALES J.C., PASSEGGER V.M., REFFERT S., SABIN L., SCHOFER P., SCHANCHE N., SCHLECKER M., SCHROFFENEGGER U., SCHWARZ R.P., SCHWEITZER A., SOTA A., TENENBAUM P., TRIFONOV T., VANAVERBEKE S. and ZECHMEISTER M.

Abstract (from CDS):

We report the discovery of GJ 3929 b, a hot Earth-sized planet orbiting the nearby M3.5 V dwarf star, GJ 3929 (G 180-18, TOI-2013). Joint modelling of photometric observations from TESS sectors 24 and 25 together with 73 spectroscopic observations from CARMENES and follow-up transit observations from SAINT-EX, LCOGT, and OSN yields a planet radius of R_b = 1.150 ± 0.040 R_⊕, a mass of M_b = 1.21 ± 0.42 M_⊕, and an orbital period of P_b = 2.6162745 ± 0.0000030 d. The resulting density of ρ_b = 4.4 ± 1.6 g cm^–3 is compatible with the Earth's mean density of about 5.5 g cm^–3. Due to the apparent brightness of the host star (J = 8.7 mag) and its small size, GJ 3929 b is a promising target for atmospheric characterisation with the JWST. Additionally, the radial velocity data show evidence for another planet candidate with P_[c] = 14.303 ± 0.035 d, which is likely unrelated to the stellar rotation period, P_rot = 122 ± 13 d, which we determined from archival HATNet and ASAS-SN photometry combined with newly obtained TJO data.

Abstract Copyright: © ESO 2022

Journal keyword(s): planetary systems - techniques: radial velocities - techniques: photometric - stars: individual: GJ 3929 - stars: late-type - planets and satellites: detection

VizieR on-line data: <Available at CDS (J/A+A/659/A17): tableg1.dat>

Simbad objects: 9

Full paper

View the references in ADS

Number of rows : 9

N	Identifier	Otype	ICRS (J2000) RA	ICRS (J2000) DEC	Mag B	Mag R	Sp type	#ref 1850 - 2023
1	NAME G 268-38c	Pl	00 44 59.3314993038	-15 16 17.543124886			~	56
2	LHS 1478b	Pl?	02 57 18.2591283675	+76 33 11.250290023			~	11
3	NAME L 231-32b	Pl	04 33 39.7202257810	-51 57 22.436253190			~	23
4	GJ 3473 b	Pl?	08 02 22.8828841960	+03 20 19.692275006			~	13
5	NAME L 98-59 b	Pl	08 18 07.6215096918	-68 18 46.799548510			~	32
6	NAME L 678-39b	Pl	09 36 01.6372518187	-21 39 38.878281901			~	51
7	G 180-18	PM*	15 58 18.7976355993	+35 24 24.279816765	14.33	12.421	M3.5V	35
8	GJ 3929 b	Pl?	15 58 18.7976355993	+35 24 24.279816765			~	6
9	NAME L 210-70b	Pl	20 27 42.0813988928	-56 27 25.156653917			~	26

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