J/A+A/566/A130 Rotation and variability of substellar objects (Crossfield, 2014)
Doppler imaging of exoplanets and brown dwarfs.
Crossfield I.J.M.
<Astron. Astrophys. 566, A130 (2014)>
=2014A&A...566A.130C 2014A&A...566A.130C
ADC_Keywords: Stars, variable - Rotational velocities
Keywords: instrumentation: spectrographs - techniques: spectroscopic -
catalogs - planets and satellites: atmospheres - brown dwarfs -
stars: imaging
Abstract:
Doppler Imaging produces 2D global maps of rotating objects using
high-dispersion spectroscopy. When applied to brown dwarfs and
extrasolar planets, this technique can constrain global atmospheric
dynamics and/or magnetic effects on these objects in un- precedented
detail. I present the first quantitative assessment of the prospects
for Doppler Imaging of substellar objects with current facilities and
with future giant ground-based telescopes. Observations will have the
greatest sensitivity in K band, but the H and L bands will also be
useful for these purposes. To assess the number and availability of
targets, I also present a compilation of all measurements of
photometric variability, rotation period (P), and projected rotational
velocity (vsini) for brown dwarfs and exoplanets. Several bright
objects are already accessible to Doppler Imaging with currently
available instruments. With the development of giant ground-based
telescopes, Doppler Imaging will become feasible for many dozens of
brown dwarfs and for the few brightest directly imaged extrasolar
planets (such as beta Pic b). The present set of measurements of P,
vsini, and variability are incomplete for many objects, and the sample
is strongly biased toward early-type objects (<L5). Thus, surveys to
measure these quantities for later-type objects will be especially
helpful in expanding the sample of candidates for global weather
monitoring via Doppler Imaging.
Description:
Measurements of variability, projected rotational velocities (vsini),
and rotation periods for brown dwarfs and exoplanets compiled from the
literature. Also included are information on spectral type, binarity,
youth, near-infrared photometry (2MASS JHKs). References are included
for all reported values.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
rotation.dat 246 347 Variability and rotation measurements
rotation.fits 2880 75 FITS version of the table
refs.dat 148 171 References
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See also:
J/PAZh/27/403 : CCD R photometry in the UMa supercluster (Kopylova+, 2001)
Byte-by-byte Description of file: rotation.dat
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Bytes Format Units Label Explanations
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1- 26 A26 --- Name Name of brown dwarf or exoplanet
28- 29 I2 h RAh Right ascension (J2000)
31- 32 I2 min RAm Right ascension (J2000)
34- 39 F6.3 s RAs Right ascension (J2000)
41 A1 --- DE- Declination sign (J2000)
42- 43 I2 deg DEd Declination (J2000)
45- 46 I2 arcmin DEm Declination (J2000)
48- 52 F5.2 arcsec DEs Declination (J2000)
54 I1 --- fy [0/1] Flag for youth; 1 if young
56 I1 --- fb [1]? Flag for binarity; 1 if a binary
58- 65 F8.5 arcsec Sep [0/22]? Separation of binary components
67- 76 A10 --- r_Sep Reference for multiplicity (in refs.dat file)
78- 82 F5.2 km/s vsini [0/86]? Projected rotational velocity
84- 88 F5.2 km/s e_vsini ? rms uncertainty on vsini
90- 91 I2 km/s B_vsini ?=- Upper limit for vsini
93-110 A18 --- r_vsini Reference for vsini (in refs.dat file)
112 A1 --- l_Per Limit flag on Per
113-119 F7.3 h Per [1.4/114]? Period
121-129 A9 --- r_Per Period reference (in refs.dat file)
131-136 F6.4 --- Var [0/1]? Variability
138-153 A16 --- n_Var Bandpass of variability measurement
155-171 A17 --- r_Var Variability reference (in refs.dat file)
173-180 A8 --- SpT Spectral type
182-186 F5.2 --- SpT.N ?=- Numerical spectral type (M0=0, L0=10)
188-200 A13 --- n_SpT Note on Spectral type from DwarfArchives.org
202-207 A6 --- r_SpT Reference for SpType (in refs.dat file)
209-214 F6.3 mag Jmag 2MASS J-band NIR flux
216-220 F5.3 mag e_Jmag rms uncertainty on Jmag
222-227 F6.3 mag Hmag 2MASS H-band NIR flux
229-233 F5.3 mag e_Hmag rms uncertainty on Hmag
235-240 F6.3 mag Ksmag 2MASS Ks-band NIR flux
242-246 F5.3 mag e_Ksmag rms uncertainty on Ksmag
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Byte-by-byte Description of file: refs.dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- Ref Reference number
5- 23 A19 --- BibCode BibCode
25- 55 A31 --- Aut Author's name
57-148 A92 --- Com Comments
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Acknowledgements:
Ian Crossfield, ianc(at)lpl.arizona.edu
(End) Ian Crossfield [MPIA, Germany], Patricia Vannier [CDS] 06-Jun-2014