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ASTROMETRIC EXOPLANET DETECTION WITH GAIA

Perryman, Michael; Hartman, Joel; Bakos, Gaspar A. and Lindegren, Lennart LU (2014) In Astrophysical Journal 797(1).
Abstract
We provide a revised assessment of the number of exoplanets that should be discovered by Gaia astrometry, extending previous studies to a broader range of spectral types, distances, and magnitudes. Our assessment is based on a large representative sample of host stars from the TRILEGAL Galaxy population synthesis model, recent estimates of the exoplanet frequency distributions as a function of stellar type, and detailed simulation of the Gaia observations using the updated instrument performance and scanning law. We use two approaches to estimate detectable planetary systems: one based on the signal-to-noise ratio of the astrometric signature per field crossing, easily reproducible and allowing comparisons with previous estimates, and a... (More)
We provide a revised assessment of the number of exoplanets that should be discovered by Gaia astrometry, extending previous studies to a broader range of spectral types, distances, and magnitudes. Our assessment is based on a large representative sample of host stars from the TRILEGAL Galaxy population synthesis model, recent estimates of the exoplanet frequency distributions as a function of stellar type, and detailed simulation of the Gaia observations using the updated instrument performance and scanning law. We use two approaches to estimate detectable planetary systems: one based on the signal-to-noise ratio of the astrometric signature per field crossing, easily reproducible and allowing comparisons with previous estimates, and a new and more robust metric based on orbit fitting to the simulated satellite data. With some plausible assumptions on planet occurrences, we find that some 21,000 (+/- 6000) high-mass (similar to 1-15M(J)) long-period planets should be discovered out to distances of similar to 500 pc for the nominal 5 yr mission (including at least 1000-1500 around M dwarfs out to 100 pc), rising to some 70,000 (+/- 20,000) for a 10 yr mission. We indicate some of the expected features of this exoplanet population, amongst them similar to 25-50 intermediate-period (P similar to 2-3 yr) transiting systems. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
astrometry, planets and satellites: general, space vehicles: instruments
in
Astrophysical Journal
volume
797
issue
1
publisher
University of Chicago Press
external identifiers
  • wos:000345915000014
  • scopus:84914700399
ISSN
0004-637X
DOI
10.1088/0004-637X/797/1/14
language
English
LU publication?
yes
id
c3fcda44-285f-4892-8d14-07bffca8f332 (old id 4962605)
date added to LUP
2015-01-29 11:50:22
date last changed
2017-11-19 03:44:05
@article{c3fcda44-285f-4892-8d14-07bffca8f332,
  abstract     = {We provide a revised assessment of the number of exoplanets that should be discovered by Gaia astrometry, extending previous studies to a broader range of spectral types, distances, and magnitudes. Our assessment is based on a large representative sample of host stars from the TRILEGAL Galaxy population synthesis model, recent estimates of the exoplanet frequency distributions as a function of stellar type, and detailed simulation of the Gaia observations using the updated instrument performance and scanning law. We use two approaches to estimate detectable planetary systems: one based on the signal-to-noise ratio of the astrometric signature per field crossing, easily reproducible and allowing comparisons with previous estimates, and a new and more robust metric based on orbit fitting to the simulated satellite data. With some plausible assumptions on planet occurrences, we find that some 21,000 (+/- 6000) high-mass (similar to 1-15M(J)) long-period planets should be discovered out to distances of similar to 500 pc for the nominal 5 yr mission (including at least 1000-1500 around M dwarfs out to 100 pc), rising to some 70,000 (+/- 20,000) for a 10 yr mission. We indicate some of the expected features of this exoplanet population, amongst them similar to 25-50 intermediate-period (P similar to 2-3 yr) transiting systems.},
  articleno    = {14},
  author       = {Perryman, Michael and Hartman, Joel and Bakos, Gaspar A. and Lindegren, Lennart},
  issn         = {0004-637X},
  keyword      = {astrometry,planets and satellites: general,space vehicles: instruments},
  language     = {eng},
  number       = {1},
  publisher    = {University of Chicago Press},
  series       = {Astrophysical Journal},
  title        = {ASTROMETRIC EXOPLANET DETECTION WITH GAIA},
  url          = {http://dx.doi.org/10.1088/0004-637X/797/1/14},
  volume       = {797},
  year         = {2014},
}