ExELS: an exoplanet legacy science proposal for the ESA Euclid mission - I. Cold exoplanets

doi:10.1093/mnras/stt927

	ExELS: an exoplanet legacy science proposal for the ESA Euclid mission - I. Cold exoplanets
	Cassan, A.10; Penny, M. T.2,3; Kerins, E.3; Rattenbury, N.3; Beaulieu, J. -P.10; Robin, A. C.9; Mao, S.3,8 ; Batista, V.2; Novati, S. Calchi 1,7; Fouque, P.6
刊名	MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
	2013-09-01
卷号	434 期号:1 页码:2-22
关键词	Gravitational Lensing: Micro Planets And Satellites: Detection Stars: Low-mass Planetary Systems Galaxy: Bulge
DOI	10.1093/mnras/stt927
英文摘要	The Euclid mission is the second M-class mission of the ESA Cosmic Vision programme, with the principal science goal of studying dark energy through observations of weak lensing and baryon acoustic oscillations. Euclid is also expected to undertake additional Legacy Science programmes. One such proposal is the Exoplanet Euclid Legacy Survey (ExELS) which will be the first survey able to measure the abundance of exoplanets down to Earth mass for host separations from similar to 1 au out to the free-floating (unbound) regime. The cold and free-floating exoplanet regimes represent a crucial discovery space for testing planet formation theories. ExELS will use the gravitational microlensing technique and will detect 1000 microlensing events per month over 1.6 deg(2) of the Galactic bulge. We assess how many of these events will have detectable planetary signatures using a detailed multiwavelength microlensing simulator - the Manchester-Besancon microLensing Simulator (MAB mu LS) - which incorporates the Besancon Galactic model with 3D extinction. MAB mu LS is the first theoretical simulation of microlensing to treat the effects of point spread function (PSF) blending self-consistently with the underlying Galactic model. We use MAB mu LS, together with current numerical models for the Euclid PSFs, to explore a number of designs and de-scope options for ExELS, including the exoplanet yield as a function of filter choice and slewing time, and the effect of systematic photometry errors. Using conservative extrapolations of current empirical exoplanet mass functions determined from ground-based microlensing and radial velocity surveys, ExELS can expect to detect a few hundred cold exoplanets around mainly G-, K- and M-type stellar hosts, including similar to 45 Earth-mass planets and similar to 6 Mars-mass planets for an observing programme totalling 10 months. ExELS will be capable of measuring the cold exoplanet mass function down to Earth mass or below, with orbital separations ranging from similar to 1 au out to infinity (i.e. the free-floating regime). Recent ground-based microlensing measurements indicate a significant population of free-floating Jupiters, in which case ExELS will detect hundreds of free-floating planets. ExELS will also be sensitive to hot exoplanets and sub-stellar companions through their transit signatures and this is explored in a companion paper.
语种	英语
WOS记录号	WOS:000323636800001
内容类型	期刊论文
源URL	[http://ir.bao.ac.cn/handle/114a11/8891]
专题	国家天文台_星系宇宙学研究部
作者单位	1.Univ Salerno, Dipartimento Fis ER Caianiello, I-84084 Fisciano, SA, Italy 2.Ohio State Univ, Dept Astron, Columbus, OH 43210 USA 3.Univ Manchester, Sch Phys & Astron, Jodrell Bank Ctr Astrophys, Manchester M13 9PL, Lancs, England 4.Australian Natl Univ, Res Sch Astron & Astrophys, Weston, ACT 2611, Australia 5.Ctr Astrobiol CSIC INTA, E-28850 Madrid, Spain 6.CNRS Univ Toulouse, IRAP, F-31400 Toulouse, France 7.IIASS, I-84019 Vietri Sul Mare, SA, Italy 8.Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China 9.Univ Franche Comte, CNRS UMR6213, Inst Utinam, Observ Besancon, F-25030 Besancon, France 10.Univ Paris 06, CNRS UMR7095, Inst Astrophys Paris, F-75014 Paris, France
推荐引用方式 GB/T 7714	Cassan, A.,Penny, M. T.,Kerins, E.,et al. ExELS: an exoplanet legacy science proposal for the ESA Euclid mission - I. Cold exoplanets[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2013,434(1):2-22.
APA	Cassan, A..,Penny, M. T..,Kerins, E..,Rattenbury, N..,Beaulieu, J. -P..,...&Zapatero Osorio, M. R..(2013).ExELS: an exoplanet legacy science proposal for the ESA Euclid mission - I. Cold exoplanets.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,434(1),2-22.
MLA	Cassan, A.,et al."ExELS: an exoplanet legacy science proposal for the ESA Euclid mission - I. Cold exoplanets".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 434.1(2013):2-22.