Toward the Detection of Transiting Hot Earths and Hot Neptunes in Open Clusters

• Autorzy: Pepper J. , Gaudi B. S.
• Języki publikacji: EN

Abstrakty

EN

Radial velocity searches for extrasolar planets have recently detected several very low mass (7-20 M_solar) planets in close orbits with periods ≤10 days. We consider the prospects for detecting the analogs of these planets in Galactic open clusters via transits. We outline the requirements for constructing a transit survey that would allow one to probe such "Hot Earths" and "Hot Neptunes." Specifically, we present a simple criterion for detection that defines the minimum aperture required to detect planets of a given radius in a cluster at a given distance. Adopting photometric precisions that have been demonstrated in state-of-the-art variability surveys, we then predict the number of planets one could potentially detect with ambitious transit surveys toward several open clusters. Dedicated surveys lasting more than 20 nights with Pan-STARRS toward the Hyades and Praesepe could detect a handful of Hot Earths, if the majority of stars host such planets. Similar surveys with larger aperture telescopes (e.g., CFHT, MMT), toward M 67, M 35, M 50, and M 37 could detect Hot Neptunes, provided that their frequency is ≥1%. The majority of planets will be detected around M dwarfs; detecting Hot Neptunes around such primaries requires photometric precisions of ≈1%, whereas Hot Earths require ≈0.1%. We discuss potential hurdles in detecting and confirming small planets in ground-based surveys, including correlated noise, false positives, and intrinsic stellar variability.

Słowa kluczowe

EN

open clusters and associations: general; Techniques: photometric; Surveys; planetary systems

• Wydawca: Copernicus Foundation for Polish Astronomy
• Czasopismo: Acta Astronomica
• Rocznik: 2006
• Tom: Vol. 56, No. 2
• Strony: 183--197
• Opis fizyczny: Bibliogr. 43 poz., rys., wykr.

Twórcy

autor

Pepper J.

• Ohio State University Department of Astronomy, 4055 McPherson Lab, 140 West 18th Ave., Columbus, OH 43210, USA

autor

Gaudi B. S.

• Harvard-Smithsonian Center for Astrophysics, 60 Garden St., Cambridge, MA 02138, USA

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