J/A+A/664/A111 Free-floating planet candidates in Upp Sco and Oph (Bouy+, 2022)
Infrared spectroscopy of free-floating planet candidates in
Upper Scorpius and Ophiuchus.
Bouy H., Tamura M., Barrado D., Motohara K., Castro Rodriguez N.,
Miret-Roig N., Konishi M., Koyama S., Takahashi H., Huelamo N., Bertin E.,
Olivares J., Sarro L.M., Berihuete A., Cuillandre J.-C., Galli P.A.B.,
Yoshii Y., Miyata T.
<Astron. Astrophys. 664, A111 (2022)>
=2022A&A...664A.111B 2022A&A...664A.111B (SIMBAD/NED BibCode)
ADC_Keywords: Star Forming Region ; Stars, double and multiple ; Exoplanets ;
Spectroscopy
Keywords: brown dwarfs - stars: late-type - stars: pre-main sequence -
planets and satellites: formation
Abstract:
A rich population of low-mass brown dwarfs and isolated planetary mass
objects has been reported in the Upper Scorpius and Ophiuchus
star-forming complex. We investigate the membership, nature, and
properties of 17 of these isolated planetary mass candidates using
low-resolution near-infrared spectra. We investigated the membership
by looking for evidence of their youth using four diagnostics: the
slope of the continuum between the J and Ks band, the Hcont, and the
TLI-g gravity-sensitive indices. In addition, we compared the spectra
to young and field (old) M and L-dwarf standards. All the targets but
one are confirmed as young ultracool objects, with spectral types
between L0 and L6 and masses in the range 0.004-0.013M☉,
according to evolutionary models. The status of the last target is
unclear at this point. Only one possible contaminant has been
identified among the 17 targets, suggesting that the contamination
level of the original sample must be low (<6%).
Description:
We obtained near-infrared spectra of 18 ultracool candidate
members of Upper Scorpius and Ophiuchus discovered by Miret-Roig et
al. (2022NatAs...6...89M 2022NatAs...6...89M, Cat. J/other/NatAs/6.89) using SWIMS at the
Subaru telescope and EMIR at the Grantecan telescope.
We also provide gravity sensitive indices measured in 891 spectra of
the SPEX library
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table1.dat 151 18 Targets observed
tableb4.dat 107 890 Gravity sensitive indices measured
in 891 spectra of the SPEX library
fits/* . 18 Individual fits spectra
--------------------------------------------------------------------------------
See also:
J/other/NatAs/6.89 : Upper Scorpius members (Miret-Roig+, 2022)
Byte-by-byte Description of file: table1.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 5 A5 --- Inst Instrument (SWIMS or EMIR)
7- 29 A23 --- Name Name (DANCe JHHMMSSss+DDMMSSs)
31- 34 I4 --- ID Identification number (1)
36- 37 I2 h RAh Right ascension (J2000)
39- 40 I2 min RAm Right ascension (J2000)
42- 46 F5.2 s RAs Right ascension (J2000)
48 A1 --- DE- Declination sign (J2000)
49- 50 I2 deg DEd Declination (J2000)
52- 53 I2 arcmin DEm Declination (J2000)
55- 58 F4.1 arcsec DEs Declination (J2000)
60- 63 F4.2 mag AVmax Integrated line-of-sight interstellar reddening
to 250pc in the direction of the source (2)
65- 69 F5.2 mag imag i magnitude
71- 74 F4.2 mag e_imag rms uncertainty on i magnitude
76- 80 F5.2 mag zmag ?=- z magnitude
82- 85 F4.2 mag e_zmag ? rms uncertainty on z magnitude
87- 91 F5.2 mag ymag ?=- y magnitude
93- 96 F4.2 mag e_ymag ? rms uncertainty on y magnitude
98-102 F5.2 mag Jmag J magnitude
104-107 F4.2 mag e_Jmag rms uncertainty on J magnitude (2MASS system)
109-113 F5.2 mag Hmag H magnitude
115-118 F4.2 mag e_Hmag rms uncertainty on H magnitude (2MASS system)
120-124 F5.2 mag Ksmag Ks magnitude
126-129 F4.2 mag e_Ksmag rms uncertainty on Ks magnitude (2MASS system)
131-135 I5 s ExpTime Exposure time, NDITxDIT
137-151 A15 --- FileName Name of spectrum fits file in subdirectory fits
--------------------------------------------------------------------------------
Note (1): From Miret-Roig et al. (2022NatAs...6...89M 2022NatAs...6...89M, Cat. J/other/NatAs/6.89)
Note (2): as computed by Green et al. (2019ApJ...887...93G 2019ApJ...887...93G).
--------------------------------------------------------------------------------
Byte-by-byte Description of file: tableb4.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 28 A28 --- Name Designation
30- 42 F13.9 deg RAdeg ? Right Ascencion (J2000)
44- 56 F13.9 deg DEdeg ? Declination (J2000)
58- 61 A4 --- SpType Spectral type
63- 67 A5 --- SpecClass SPEX Gravity class
69- 73 F5.3 --- Hcont ? Hcont index value
75- 95 A21 --- e_Hcont Error on Hcont
97-101 F5.3 --- TLI-g TLI-g index value
103-107 F5.3 --- e_TLI-g Error on TLI-g
--------------------------------------------------------------------------------
Acknowledgements:
Herve Bouy, herve.bouy(at)u-bordeaux.fr
(End) Patricia Vannier [CDS] 14-Jun-2022