2025ApJ...993...69V

Query : 2025ApJ...993...69V

2025ApJ...993...69V - Astrophys. J., 993, 69 (2025/November-1)

Constraints on the Orbit of the Young Substellar Companion GQ Lup B from High-resolution Spectroscopy and VLTI/GRAVITY Astrometry.

VENKATESAN V., BLUNT S., WANG J.J., LACOUR S., MARLEAU G.-D., COLEMAN G.A.L., GUERRERO L., BALMER W.O., PUEYO L., STOLKER T., KAMMERER J., POURRE N., NOWAK M., RICKMAN E., SIVARAMAKRISHNAN A., SING D., WAGNER K., LAGRANGE A.-M., ABUTER R., AMORIM A., ASENSIO-TORRES R., BERGER J.-P., BEUST H., BOCCALETTI A., BONNEFOY M., BONNET H., BORDONI M.S., BOURDAROT G., BRANDNER W., CANTALLOUBE F., CASELLI P., CHARNAY B., CHAUVIN G., CHAVEZ A., CHOMEZ A., CHOQUET E., CHRISTIAENS V., CLENET Y., COUDE DU FORESTO V., CRIDLAND A., DAVIES R., DEMBET R., DEXTER J., DRESCHER A., DUVERT G., ECKART A., EISENHAUER F., FORSTER SCHREIBER N.M., GARCIA P., GARCIA LOPEZ R., GENDRON E., GENZEL R., GILLESSEN S., GIRARD J.H., GRANT S., HAUBOIS X., HEISSEL G., HENNING T., HINKLEY S., HIPPLER S., HOULLE M., HUBERT Z., JOCOU L., KEPPLER M., KERVELLA P., KREIDBERG L., KURTOVIC N.T., LAPEYRERE V., LE BOUQUIN J.-B., LUTZ D., MAIRE A.-L., MANG F., MERAND A., MORDASINI C., MOUILLET D., NASEDKIN E., OTT T., OTTEN G.P.P.L., PALADINI C., PAUMARD T., PERRAUT K., PERRIN G., PETRUS S., PFUHL O., RIBEIRO D.C., RUSTAMKULOV Z., SHANGGUAN J., SHIMIZU T., SHIELDS A., STADLER J., STRAUB O., STRAUBMEIER C., STURM E., TACCONI L.J., VIGAN A., VINCENT F., VON FELLENBERG S.D., WIDMANN F., WINTERHALDER T.O., WOILLEZ J., YAZICI S. (The ExoGRAVITY Collaboration)

Abstract (from CDS):

Understanding the orbits of giant planets is critical for testing planet formation models, particularly at wide separations (>10 au) where traditional core accretion becomes inefficient. However, constraining orbits at these separations has historically been challenging due to sparse orbital coverage and related degeneracies in the orbital parameters. In this work, we use existing high-resolution (R ∼ 100,000) spectroscopic measurements from CRIRES+, astrometric data from SPHERE, NACO, and Atacama Large Millimeter/submillimeter Array, and combine it with new high-precision GRAVITY astrometry data to refine the orbit of GQ Lup B, a ∼30 MJ companion at ∼100 au, in a system that also hosts a circumstellar disk and a wide companion, GQ Lup C. Including radial velocity (RV) data significantly improves orbital constraints by breaking the degeneracy between inclination and eccentricity that plagues astrometry-only fits for long-period companions. Our work is one of the first to combine high-precision astrometry with the companion's relative radial velocity measurements to achieve significantly improved orbital constraints. The eccentricity is refined from $e=0.4{7}_{-0.16}^{+0.14}$ (GRAVITY only) to $e=0.3{5}_{-0.09}^{+0.10}$ when RVs and GRAVITY data are combined. We also compute the mutual inclinations between the orbit of GQ Lup B, the circumstellar disk, the stellar spin axis, and the disk of GQ Lup C. The orbit is misaligned by $6{3}_{-14}^{+6}$° relative to the circumstellar disk, $5{2}_{-24}^{+19}$° with the host star's spin axis, but appears more consistent ($3{4}_{-13}^{+6}$°) with the inclination of the wide tertiary companion GQ Lup C's disk. These results support a formation scenario for GQ Lup B consistent with cloud fragmentation. They highlight the power of combining companion RV constraints with interferometric astrometry to probe the dynamics and formation of wide-orbit substellar companions.

Abstract Copyright: © 2025. The Author(s). Published by the American Astronomical Society.

Journal keyword(s): Exoplanet formation - Orbits

Simbad objects: 12

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Number of rows : 12
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 HD 17453 * 02 45 07.1988986424 -62 17 44.113963740   10.42 10.06     F6V 6 0
2 NAME AF Lep b Pl 05 27 04.7633281608 -11 54 03.466002240           ~ 75 0
3 * bet Pic b Pl 05 47 17.0876901 -51 03 59.441135           ~ 627 1
4 NAME TYC 8998-760-1B LM* 13 25 12.33 -64 56 19.7           ~ 71 0
5 HD 136164C LM* 15 20 13.40 -34 55 31.5           M6-L2 6 0
6 V* GQ Lup B LM* 15 49 12.05 -35 39 05.1           M9e 165 1
7 V* GQ Lup Or* 15 49 12.1053805848 -35 39 05.058139788 12.19 12.76 11.66 11.15   K7Ve 334 1
8 V* GQ Lup C LM* 15 49 13.3077704592 -35 39 11.761171488           M4 11 1
9 NAME Lupus Complex SFR 16 03 -38.1           ~ 851 0
10 HD 174536 * 18 51 37.0285175367 -17 18 36.426626726   10.01 8.56     G8/K1III 7 0
11 * b03 Cyg b Pl 20 14 32.0323540824 +36 48 22.700909124           ~ 22 0
12 HD 206893b Pl 21 45 21.9052532928 -12 47 00.060804636           ~ 48 0

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