CaltechAUTHORS
  A Caltech Library Service

ExELS: an exoplanet legacy science proposal for the ESA Euclid mission – II. Hot exoplanets and sub-stellar systems

McDonald, I. and Kerins, E. and Penny, M. and Beaulieu, J. P. and Batista, V. and Calchi Novati, S. and Cassan, A. and Fouqué, P. and Mao, S. and Marquette, J. B. and Rattenbury, N. and Robin, A. C. and Tisserand, P. and Zapatero Osorio, M. R. (2014) ExELS: an exoplanet legacy science proposal for the ESA Euclid mission – II. Hot exoplanets and sub-stellar systems. Monthly Notices of the Royal Astronomical Society, 445 (4). pp. 4137-4154. ISSN 0035-8711. http://resolver.caltech.edu/CaltechAUTHORS:20150122-083653200

[img] PDF - Published Version
See Usage Policy.

1502Kb
[img] PDF - Submitted Version
See Usage Policy.

1456Kb

Use this Persistent URL to link to this item: http://resolver.caltech.edu/CaltechAUTHORS:20150122-083653200

Abstract

The Exoplanet Euclid Legacy Survey (ExELS) proposes to determine the frequency of cold exoplanets down to Earth mass from host separations of ∼1 au out to the free-floating regime by detecting microlensing events in Galactic bulge. We show that ExELS can also detect large numbers of hot, transiting exoplanets in the same population. The combined microlensing+transit survey would allow the first self-consistent estimate of the relative frequencies of hot and cold sub-stellar companions, reducing biases in comparing ‘near-field’ radial velocity and transiting exoplanets with ‘far-field’ microlensing exoplanets. The age of the bulge and its spread in metallicity further allows ExELS to better constrain both the variation of companion frequency with metallicity and statistically explore the strength of star–planet tides. We conservatively estimate that ExELS will detect ∼4100 sub-stellar objects, with sensitivity typically reaching down to Neptune-mass planets. Of these, ∼600 will be detectable in both Euclid's VIS (optical) channel and Near Infrared Spectrometer and Photometer (NISP)-H-band imager, with ∼90 per cent of detections being hot Jupiters. Likely scenarios predict a range of 2900–7000 for VIS and 400–1600 for H band. Twice as many can be expected in VIS if the cadence can be increased to match the 20-min H-band cadence. The separation of planets from brown dwarfs via Doppler boosting or ellipsoidal variability will be possible in a handful of cases. Radial velocity confirmation should be possible in some cases, using 30 m-class telescopes. We expect secondary eclipses, and reflection and emission from planets to be detectable in up to ∼100 systems in both VIS and NISP-H. Transits of ∼500 planetary-radius companions will be characterized with two-colour photometry and ∼40 with four-colour photometry (VIS,YJH), and the albedo of (and emission from) a large sample of hot Jupiters in the H band can be explored statistically.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1093/mnras/stu2036DOIArticle
http://mnras.oxfordjournals.org/content/445/4/4137PublisherArticle
http://arxiv.org/abs/1410.0363arXivDiscussion Paper
ORCID:
AuthorORCID
Calchi Novati, S.0000-0002-7669-1069
Additional Information:© 2014 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. Accepted 2014 September 29. Received 2014 September 15; in original form 2013 November 13. We thank the anonymous referee for their helpful comments which improved the quality and legibility of our paper.
Group:Infrared Processing and Analysis Center (IPAC)
Subject Keywords:planets and satellites: detection; planet–star interactions – stars: low-mass; planetary systems; stars: variables: general; Galaxy: bulge
Record Number:CaltechAUTHORS:20150122-083653200
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20150122-083653200
Official Citation:McDonald, I., Kerins, E., Penny, M., Beaulieu, J.-P., Batista, V., Calchi Novati, S., . . . Zapatero Osorio, M. R. (2014). ExELS: an exoplanet legacy science proposal for the ESA Euclid mission – II. Hot exoplanets and sub-stellar systems. Monthly Notices of the Royal Astronomical Society, 445(4), 4137-4154. doi: 10.1093/mnras/stu2036
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:53974
Collection:CaltechAUTHORS
Deposited By: Jason Perez
Deposited On:22 Jan 2015 20:24
Last Modified:02 May 2016 18:44

Repository Staff Only: item control page