2017AJ....154..218N

Query : 2017AJ....154..218N

2017AJ....154..218N - Astron. J., 154, 218-218 (2017/December-4)

Evidence that the directly imaged planet HD 131399 Ab is a background star.

NIELSEN E.L., DE ROSA R.J., RAMEAU J., WANG J.J., ESPOSITO T.M., MILLAR-BLANCHAER M.A., MAROIS C., VIGAN A., AMMONS S.M., ARTIGAU E., BAILEY V.P., BLUNT S., BULGER J., CHILCOTE J., COTTEN T., DOYON R., DUCHENE G., FABRYCKY D., FITZGERALD M.P., FOLLETTE K.B., GERARD B.L., GOODSELL S.J., GRAHAM J.R., GREENBAUM A.Z., HIBON P., HINKLEY S., HUNG L.-W., INGRAHAM P., JENSEN-CLEM R., KALAS P., KONOPACKY Q., LARKIN J.E., MACINTOSH B., MAIRE J., MARCHIS F., METCHEV S., MORZINSKI K.M., MURRAY-CLAY R.A., OPPENHEIMER R., PALMER D., PATIENCE J., PERRIN M., POYNEER L., PUEYO L., RAFIKOV R.R., RAJAN A., RANTAKYRO F.T., RUFFIO J.-B., SAVRANSKY D., SCHNEIDER A.C., SIVARAMAKRISHNAN A., SONG I., SOUMMER R., THOMAS S., WALLACE J.K., WARD-DUONG K., WIKTOROWICZ S. and WOLFF S.

Abstract (from CDS):

We present evidence that the recently discovered, directly imaged planet HD 131399 Ab is a background star with nonzero proper motion. From new JHK1L' photometry and spectroscopy obtained with the Gemini Planet Imager, VLT/SPHERE, and Keck/NIRC2, and a reanalysis of the discovery data obtained with VLT/SPHERE, we derive colors, spectra, and astrometry for HD 131399 Ab. The broader wavelength coverage and higher data quality allow us to reinvestigate its status. Its near-infrared spectral energy distribution excludes spectral types later than L0 and is consistent with a K or M dwarf, which are the most likely candidates for a background object in this direction at the apparent magnitude observed. If it were a physically associated object, the projected velocity of HD 131399 Ab would exceed escape velocity given the mass and distance to HD 131399 A. We show that HD 131399 Ab is also not following the expected track for a stationary background star at infinite distance. Solving for the proper motion and parallax required to explain the relative motion of HD 131399 Ab, we find a proper motion of 12.3 mas yr–1. When compared to predicted background objects drawn from a galactic model, we find this proper motion to be high but consistent with the top 4% fastest-moving background stars. From our analysis, we conclude that HD 131399 Ab is a background K or M dwarf.

Abstract Copyright: © 2017. The American Astronomical Society. All rights reserved.

Journal keyword(s): astrometry - instrumentation: adaptive optics - planets and satellites: detection - stars: individual: HD 131399 - techniques: image processing - techniques: spectroscopic - techniques: spectroscopic

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 - 2026 		#notes
1 Wolf 47 PM* 01 03 19.8350070578 +62 21 55.837228636   15.34 13.21 12.4   M5V 232 0
2 HD 8049B WD* 01 19 14.9979918587 -43 37 48.519462474 12.02   13.5     D 7 0
3 * 51 Eri PM* 04 37 36.1326090888 -02 28 24.775726260   5.486 5.209     F0IV 285 0
4 * 51 Eri b Pl 04 37 36.1326090888 -02 28 24.775726260           ~ 238 0
5 StKM 1-497 TT* 04 37 37.4553491592 -02 29 28.950973764   12.04 10.59   8.59 M1.1V 138 0
6 * tet01 Ori B EB* 05 35 16.1339860056 -05 23 06.784444248 7.71 8.20 7.96     B1V 380 1
7 * bet Pic b Pl 05 47 17.0876901 -51 03 59.441135           ~ 627 1
8 BD+33 1505 PM* 07 19 31.2746924218 +32 49 48.339033877   10.58   9.513   M0V 109 0
9 2MASS J11101001+0116130 BD* 11 10 10.01064 +01 16 13.0872           T5.5 86 0
10 2MASS J12545393-0122474 BD* 12 54 53.9040607346 -01 22 47.399401142           T2e: 167 0
11 HD 116434 ** 13 24 36.0977360304 -51 30 16.044711840   7.08 6.98   6.87 A2V 95 0
12 HD 131399B ** 14 54 25.1390494392 -34 08 36.372719184           ~ 6 1
13 NAME HD 131399Ab err 14 54 25.3 -34 08 34           ~ 26 1
14 HD 131399A * 14 54 25.3089604512 -34 08 34.038969972   7.16 7.08     A1V 19 0
15 HD 131399 ** 14 54 25.30919 -34 08 34.0412   7.19 7.08 8.33   A1V 47 0
16 NAME Upper Centaurus Lupus MGr 15 24 -41.9           ~ 567 1
17 V* HN Peg B BD* 21 44 28.47168 +14 46 07.7988           T2.5 143 0
18 CFBDS J214947-040308 BD* 21 49 47.20 -04 03 08.9           T7 30 0
19 * alf PsA C ** 22 48 04.4928501697 -24 22 07.717793375   14.301 12.624 12.216 9.674 M4.0Ve 94 0
20 2MASSI J2254188+312349 BD* 22 54 18.92016 +31 23 49.8300           T5.0 80 0
21 V* TW PsA BY* 22 56 24.0525564918 -31 33 56.030584767   7.58 6.48     K4Ve 316 0
22 * alf PsA PM* 22 57 39.04625 -29 37 20.0533 1.31 1.25 1.16 1.11 1.09 A4V 1303 3
23 HD 218396 El* 23 07 28.7157209544 +21 08 03.310767492   6.21 5.953     F0+VkA5mA5 1285 0

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