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)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/4962605
- author
- Perryman, Michael
; Hartman, Joel
; Bakos, Gaspar A.
and Lindegren, Lennart
LU
- organization
- publishing date
- 2014
- type
- Contribution to journal
- publication status
- published
- subject
- keywords
- astrometry, planets and satellites: general, space vehicles: instruments
- in
- Astrophysical Journal
- volume
- 797
- issue
- 1
- article number
- 14
- publisher
- American Astronomical Society
- 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
- 2016-04-01 13:11:40
- date last changed
- 2024-04-10 01:57:30
@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.}},
author = {{Perryman, Michael and Hartman, Joel and Bakos, Gaspar A. and Lindegren, Lennart}},
issn = {{0004-637X}},
keywords = {{astrometry; planets and satellites: general; space vehicles: instruments}},
language = {{eng}},
number = {{1}},
publisher = {{American Astronomical Society}},
series = {{Astrophysical Journal}},
title = {{ASTROMETRIC EXOPLANET DETECTION WITH GAIA}},
url = {{http://dx.doi.org/10.1088/0004-637X/797/1/14}},
doi = {{10.1088/0004-637X/797/1/14}},
volume = {{797}},
year = {{2014}},
}