J/ApJ/938/54 VLT-KMOS NIR sp. of SSTc2d J163134.1-240060 (Ruiz-Rodriguez+, 2022)
Discovery of a brown dwarf with quasi-spherical mass loss.
Ruiz-Rodriguez D.A., Cieza L.A., Casassus S., Almendros-Abad V., Jofre P.,
Muzic K., Ramirez K.P., Batalla-Falcon G., Dunham M.M.,
Gonzalez-Ruilova C., Hales A., Humphreys E., Nogueira P.H., Paladini C.,
Tobin J., Williams J.P., Zurlo A.
<Astrophys. J., 938, 54 (2022)>
=2022ApJ...938...54R 2022ApJ...938...54R
ADC_Keywords: Stars, M-type; Spectra, infrared; Carbon monoxide; YSOs;
Stars, brown dwarf
Keywords: Stellar wind bubbles ; Circumstellar clouds ; Stellar winds
Abstract:
We report the serendipitous discovery of an elliptical shell of CO
associated with the faint stellar object SSTc2d J163134.1-240060 as
part of the "Ophiuchus Disk Survey Employing ALMA" (ODISEA), a project
aiming to study the entire population of protoplanetary disks in the
Ophiuchus Molecular Cloud from 230GHz continuum emission and
12CO(J=2-1), 13CO(J=2-1) and C18CO(J=2-1) lines readable in
Band 6. Remarkably, we detect a bright 12CO elliptical shape
emission of ∼3"x4" toward SSTc2d J163134.1-240060 without a 230GHz
continuum detection. Based on the observed near-IR spectrum taken with
the Very Large Telescope (KMOS), the brightness of the source, its
three-dimensional motion, and Galactic dynamic arguments, we conclude
that the source is not a giant star in the distant background
(>5-10kpc) and is most likely to be a young brown dwarf in the
Ophiuchus cloud, at a distance of just ∼139pc. This is the first
report of quasi-spherical mass loss in a young brown dwarf. We suggest
that the observed shell could be associated with a thermal pulse
produced by the fusion of deuterium, which is not yet well understood,
but for a substellar object is expected to occur during a short period
of time at an age of a few Myr, in agreement with the ages of the
objects in the region. Other more exotic scenarios, such as a merger
with planetary companions, cannot be ruled out from the current
observations.
Description:
SSTc2d J163134.1-240060 was observed as part of the "Ophiuchus Disk
Survey Employing ALMA" (ODISEA) program (Project ID: 2016.1.00545.S;
PI: L. Cieza). ALMA Band 6 (1.3mm) observations were performed on
2018-Apr-27 and Aug-22, during Cycle 5 using the C43-3 configuration
(15-500m baselines). The total integration time was 54s on the science
source with a field of view of 26". See Section 3.1.
We obtained near-infrared spectroscopy of SSTc2d J163134.1-240060
using the K-band Multi-Object Spectrograph (KMOS) at the ESO's Very
Large Telescope (VLT), under ESO program ID 107.22RQ.001.
KMOS performs integral field spectroscopy (IFU) using 24 arms, each
with a squared field of view (FoV) of 2.8"x2.8", and a total FoV of
the instrument of 7.2' in diameter.
The detector integration time (DIT) was 130s, and a total of
49 exposures were obtained, using the HK band filter (∼1.5-2.4um),
providing a mean resolving power of ∼1500.
See Section 3.2.
Objects:
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RA (ICRS) DE Designation(s)
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16 31 34.08 -24 00 59.6 SSTc2d J163134.1 = SSTc2d J163134.1-240100
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
fits.dat 64 1 Summary of the VLT-KMOS spectrum of
SSTc2d J163134.1-240060 (Data behind Figure 3)
sp/* . 1 The KMOS spectrum of SSTc2d J163134.1-240060
in FITS format (Data behind Figure 3)
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See also:
J/A+AS/99/291 : CO and HCN obs. of circumstellar envelopes (Loup+ 1993)
J/ApJS/111/445 : Spectra of normal stars in the K band (Wallace+ 1997)
J/A+A/453/635 : Modelling the Gal. Interstellar Extinction (Marshall+, 2006)
J/ApJ/667/308 : Weak-line T Tauri in Spitzer c2d Survey. II. (Cieza+, 2007)
J/ApJS/173/104 : Stellar population in Chamaeleon I (Luhman, 2007)
J/ApJS/181/321 : Properties of Spitzer c2d dark clouds (Evans+, 2009)
J/ApJS/190/100 : NIR proper motion survey using 2MASS (Kirkpatrick+, 2010)
J/ApJ/745/56 : Upper Sco members rotational velocities (Dahm+, 2012)
J/A+A/547/A105 : D-burning in core accretion objects (Molliere+, 2012)
J/A+A/562/A127 : NIR integral field spectra of 15 M-L dwarfs (Bonnefoy+, 2014)
J/ApJ/786/97 : Photospheric properties of T Tauri stars (Herczeg+, 2014)
J/A+A/564/A55 : 1.1-2.4um sp. of 7 young M and L dwarfs (Manjavacas+, 2014)
J/ApJ/810/158 : M,L,T dwarfs fundamental param. and SEDs (Filippazzo+, 2015)
J/A+A/605/A116 : ALMA FITS cubes of CO(1-0) and CO(2-1) (Kerschbaum+, 2017)
J/AJ/153/46 : Spectroscopy of candidate members in Taurus (Luhman+, 2017)
J/A+A/626/A80 : Census of Rho Oph members from Gaia DR2 (Canovas+, 2019)
J/MNRAS/482/698 : Oph. DIsc Survey Employing ALMA (ODISEA). I. (Cieza+, 2019)
J/ApJ/875/L9 : ODISEA: Disk dust mass distributions (Williams+, 2019)
J/AJ/159/282 : Membership in Ophiuchus & Upper Sco complex (Esplin+, 2020)
J/A+A/638/A74 : Cat. of dense cores in Oph molecular cloud (Ladjelate+, 2020)
J/A+A/657/A129 : 13 young brown dwarfs SINFONI spectra (Almendros-Abad+, 2022)
Byte-by-byte Description of file: fits.dat
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Bytes Format Units Label Explanations
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1- 6 A6 --- --- [SSTc2d]
8-23 A16 --- SSTc2d Brown dwarf identifier (JHHMMSS.s+DDMMSS)
25-28 A4 --- Inst [KMOS] Instrument ("KMOS")
30-41 A12 --- ProgID ESO program identifier ("107.22RQ.001")
43-64 A22 --- FileName Name of the FITS file in subdirectory "sp"
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History:
From electronic version of the journal
(End) Emmanuelle Perret [CDS] 22-Aug-2024