SIMBAD references

2018A&A...615A.160C - Astronomy and Astrophysics, volume 615A, 160-160 (2018/7-1)

Discovery of a brown dwarf companion to the star HIP 64892.

CHEETHAM A., BONNEFOY M., DESIDERA S., LANGLOIS M., VIGAN A., SCHMIDT T., OLOFSSON J., CHAUVIN G., KLAHR H., GRATTON R., D'ORAZI V., HENNING T., JANSON M., BILLER B., PERETTI S., HAGELBERG J., SEGRANSAN D., UDRY S., MESA D., SISSA E., KRAL Q., SCHLIEDER J., MAIRE A.-L., MORDASINI C., MENARD F., ZURLO A., BEUZIT J.-L., FELDT M., MOUILLET D., MEYER M., LAGRANGE A.-M., BOCCALETTI A., KEPPLER M., KOPYTOVA T., LIGI R., ROUAN D., LE COROLLER H., DOMINIK C., LAGADEC E., TURATTO M., ABE L., ANTICHI J., BARUFFOLO A., BAUDOZ P., BLANCHARD P., BUEY T., CARBILLET M., CARLE M., CASCONE E., CLAUDI R., COSTILLE A., DELBOULBE A., DE CAPRIO V., DOHLEN K., FANTINEL D., FEAUTRIER P., FUSCO T., GIRO E., GLUCK L., HUBIN N., HUGOT E., JAQUET M., KASPER M., LLORED M., MADEC F., MAGNARD Y., MARTINEZ P., MAUREL D., LE MIGNANT D., MOLLER-NILSSON O., MOULIN T., ORIGNE A., PAVLOV A., PERRET D., PETIT C., PRAGT J., PUGET P., RABOU P., RAMOS J., RIGAL F., ROCHAT S., ROELFSEMA R., ROUSSET G., ROUX A., SALASNICH B., SAUVAGE J.-F., SEVIN A., SOENKE C., STADLER E., SUAREZ M., WEBER L. and WILDI F.

Abstract (from CDS):

We report the discovery of a bright, brown dwarf companion to the star HIP 64892, imaged with VLT/SPHERE during the SHINE exoplanet survey. The host is a B9.5V member of the Lower-Centaurus-Crux subgroup of the Scorpius Centaurus OB association. The measured angular separation of the companion (1.2705±0.0023") corresponds to a projected distance of 159±12AU. We observed the target with the dual-band imaging and long-slit spectroscopy modes of the IRDIS imager to obtain its spectral energy distribution (SED) and astrometry. In addition, we reprocessed archival NACO L-band data, from which we also recover the companion. Its SED is consistent with a young (<30Myr), low surface gravity object with a spectral type of M9γ±1. From comparison with the BT-Settl atmospheric models we estimate an effective temperature of Teff=2600±100K, and comparison of the companion photometry to the COND evolutionary models yields a mass of ∼29-37MJ at the estimated age of 16–7+15Myr for the system. The star HIP 64892 is a rare example of an extreme-mass ratio system (q∼0.01) and will be useful for testing models relating to the formation and evolution of such low-mass objects.

Abstract Copyright: © ESO 2018

Journal keyword(s): brown dwarfs - stars: individual: HIP 64892 - techniques: high angular resolution - planets and satellites: detection - planets and satellites: atmospheres

CDS comments: Fig.8 2M1731-271 not identified, incomplete format.

Simbad objects: 32

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2019.09.18-20:50:39

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