2015A&A...574A..64I


Query : 2015A&A...574A..64I

2015A&A...574A..64I - Astronomy and Astrophysics, volume 574A, 64-64 (2015/2-1)

Properties of the solar neighbor WISE J072003.20-084651.2.

IVANOV V.D., VAISANEN P., KNIAZEV A.Y., BELETSKY Y., MAMAJEK E.E., MUZIC K., BEAMIN J.C., BOFFIN H.M.J., POURBAIX D., GANDHI P., GULBIS A., MONACO L., SAVIANE I., KURTEV R., MAWET D., BORISSOVA J. and MINNITI D.

Abstract (from CDS):

The severe crowding towards the Galactic plane suggests that the census of nearby stars in that direction may be incomplete. Recently, Scholz reported a new M9 object at an estimated distance d≃7pc (WISE J072003.20-084651.2; hereafter WISEJ0720) at Galactic latitude b=2.3°. Our goals are to determine the physical characteristics of WISEJ0720, its kinematic properties, and to address the question of whether it is a binary object, as was suggested in the discovery paper. Optical and infrared spectroscopy from the Southern African Large Telescope and Magellan, respectively, and spectral energy distribution fitting were used to determine the spectral type of WISEJ0720. The measured radial velocity, proper motion, and parallax yielded its Galactic velocities. We also investigated if WISEJ0720 may show X-ray activity based on archival data. Our spectra are consistent with spectral type L0±1. We find no evidence for binarity, apart from a minor 2σ level difference in the radial velocities taken at two different epochs. The spatial velocity of WISEJ0720 does not connect it to any known moving group; instead, it places the object with high probability in the old thin disk or in the thick disk. The spectral energy distribution fit hints at excess in the 12µm and 22µm WISE bands which may be due to a redder companion, but the same excess is visible in other late-type objects, and it more likely implies a shortcoming of the models (e.g., problems with the effective wavelengths of the filters for these extremely cool objects, etc.) rather than a disk or redder companion. The optical spectrum shows some Hα emission, indicative of stellar activity. Archival X-ray observations yield no detection. WISEJ0720 is a new member of the solar neighborhood, the third nearest L dwarf. Our data do not support the hypothesis of its binary nature.

Abstract Copyright:

Journal keyword(s): stars: distances - solar neighborhood - stars: low-mass - stars: individual: WISE J072003.20-84651.2 - proper motions - stars: individual: 2MASS J07200708-0845589

Simbad objects: 15

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Number of rows : 15
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 * 29 Psc V* 00 01 49.4481127032 -03 01 39.011820024 4.47 4.98 5.10     B7III-IV 211 0
2 DENIS J025503.3-470049 BD* 02 55 03.6927058871 -47 00 51.356903955     22.921 19.906 17.454 L9 128 0
3 LP 944-20 LM* 03 39 35.2523500210 -35 25 43.641996333     18.69 16.39 13.288 M9.5Ve 275 0
4 HD 48381 * 06 41 42.9530764512 -33 28 11.103788640   9.57 8.50     K0IV 25 0
5 * alf CMa B WD* 06 45 09.3041925037 -16 43 00.724740067   8.41 8.44     DA1.9 519 1
6 HD 49375 * 06 46 43.4701251192 -33 40 08.052613680   8.58 8.52     A0V 8 0
7 NAME Scholz's star LM* 07 20 03.25368 -08 46 49.9044   19.9   16.9 13.80 M9.5+T5 45 0
8 2MASS J07200708-0845589 PM* 07 20 07.0868116584 -08 45 59.044881744           ~ 1 0
9 1RXS J072007.6-084541 X 07 20 07.6 -08 45 41           ~ 2 0
10 TYC 5395-4319-1 * 07 20 08.5536 -08 46 03.347   11.86 11.02     ~ 1 0
11 PN G219.2+07.5 PN 07 29 58.4752358832 -02 06 37.601058600 11.749 12.830 13.017 13.076 13.164 sdO 68 0
12 HD 65504 * 07 58 24.3223024968 -15 45 08.460882216   9.29 9.22     A0V 5 0
13 * 14 Her PM* 16 10 24.3156759007 +43 49 03.507406809   7.57   6.1   K0V 429 1
14 CD-48 13174 PM* 19 36 14.8377938816 -47 56 54.087645728   11.353 10.188 9.61   K7V 17 0
15 PG 2213-006 HS* 22 16 28.3762385784 -00 21 13.503339864 12.747 13.93 14.14 14.54 14.348 sdOB 74 0

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2022.05.28-21:19:03

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