2018A&A...617A..37C


C.D.S. - SIMBAD4 rel 1.7 - 2020.08.11CEST21:37:32

2018A&A...617A..37C - Astronomy and Astrophysics, volume 617A, 37-37 (2018/9-1)

Characterization of low-mass companion HD 142527 B.

CHRISTIAENS V., CASASSUS S., ABSIL O., KIMESWENGER S., GONZALEZ C.A.G., GIRARD J., RAMIREZ R., WERTZ O., ZURLO A., WAHHAJ Z., FLORES C., SALINAS V., JORDAN A. and MAWET D.

Abstract (from CDS):


Context. The circumstellar disk of the Herbig Fe star HD 142527 is host to several remarkable features including a warped inner disk, a 120au-wide annular gap, a prominent dust trap and several spiral arms. A low-mass companion, HD 142527 B, was also found orbiting the primary star at ∼14au.
Aims. This study aims to better characterize this companion, which could help explain its impact on the peculiar geometry of the disk. Method. We observed the source with VLT/SINFONI in H + K band in pupil-tracking mode. Data were post-processed with several algorithms based on angular differential imaging (ADI).
Results. HD 142527 B is conspicuously re-detected in most spectral channels, which enables us to extract the first medium-resolution spectrum of a low-mass companion within 0.1" from its central star. Fitting our spectrum with both template and synthetic spectra suggests that the companion is a young M2.5±1.0 star with an effective temperature of 3500±100K, possibly surrounded with a hot (1700K) circum-secondary environment. Pre-main sequence evolutionary tracks provide a mass estimate of 0.34±0.06M, independent of the presence of a hot environment. However, the estimated stellar radius and age do depend on that assumption; we find a radius of 1.37±0.05R (resp. 1.96±0.10R) and an age of 1.8–0.5+1.2Myr (resp. 0.75±0.25Myr) in the case of the presence (resp. absence) of a hot environment contributing in H+K. Our new values for the mass and radius of the companion yield a mass accretion rate of 4.1-5.8x10–9M/yr (2-3% that of the primary).
Conclusions. We have constrained the physical properties of HD 142527 B, thereby illustrating the potential for SINFONI+ADI to characterize faint close-in companions. The new spectral type makes HD 142527 B a twin of the well-known TW Hya T Tauri star, and the revision of its mass to higher values further supports its role in shaping the disk.

Abstract Copyright: © ESO 2018

Journal keyword(s): protoplanetary disks - stars: individual: HD 142527 - stars: low-mass - binaries: close - stars: pre-main sequence

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 - 2020
#notes
1 NAME Perseus Cloud SFR 03 35.0 +31 13           ~ 1071 0
2 2MASS J03430679+3148204 Y*? 03 43 06.7931564741 +31 48 20.549382386           ~ 10 0
3 [BNM2013] 32.03 215 V* 03 43 59.5389898931 +32 15 55.136207765       16.96 15.23 ~ 9 0
4 Cl* IC 348 CB 35 V* 03 44 02.1763829556 +32 19 39.989471022       15.73 14.11 ~ 10 0
5 IC 348 OpC 03 44 34 +32 09.8           ~ 1231 1
6 2MASS J03443481+3156552 Y*O 03 44 34.8045598148 +31 56 55.240788037       16.82 15.17 ~ 14 0
7 2MASS J03450206+3159341 * 03 45 02.06664 +31 59 34.1484           M4.5 1 0
8 2MASS J03452021+3217223 * 03 45 20.21160 +32 17 22.3980           M4 1 0
9 2MASS J03453230+3203150 TT* 03 45 32.3006277304 +32 03 14.927891921       16.03 14.60 M3 13 0
10 V* GG Tau Or* 04 32 30.3318954228 +17 31 40.834888327 14.84 14.78 13.40 11.54   M0e+M2.0e 647 1
11 CoKu Tau-Aur Star 4 TT* 04 41 16.8106225314 +28 40 00.077173462   16.40 14.68 14.59   M1.5e 165 0
12 HD 36112 Ae* 05 30 27.5286772598 +25 19 57.082162439   8.57 8.27     A8Ve 361 0
13 V* TW Hya TT* 11 01 51.9054298616 -34 42 17.031550898   11.94 10.50 10.626 9.18 K6Ve 1539 1
14 NAME Upper Centaurus Lupus As* 15 24 -41.9           ~ 363 1
15 HD 142527 Ae* 15 56 41.8888096574 -42 19 23.245384377   9.04 8.34     F6III 469 1

    Equat.    Gal    SGal    Ecl

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2020.08.11-21:37:32

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