학술논문
A Terrestrial Planet in a ~1 AU Orbit Around One Member of a ~15 AU Binary
Document Type
Working Paper
Author
Gould, A.; Udalski, A.; Shin, I. -G.; Porritt, I.; Skowron, J.; Han, C.; Yee, J. C.; Kozłowski, S.; Choi, J. -Y.; Poleski, R.; Wyrzykowski, Ł.; Ulaczyk, K.; Pietrukowicz, P.; Mróz, P.; Szymański, M. K.; Kubiak, M.; Soszyński, I.; Pietrzyński, G.; Gaudi, B. S.; Christie, G. W.; Drummond, J.; McCormick, J.; Natusch, T.; Ngan, H.; Tan, T. -G.; Albrow, M.; DePoy, D. L.; Hwang, K. -H.; Jung, Y. K.; Lee, C. -U.; Park, H.; Pogge, R. W.; Abe, F.; Bennett, D. P.; Bond, I. A.; Botzler, C. S.; Freeman, M.; Fukui, A.; Fukunaga, D.; Itow, Y.; Koshimoto, N.; Larsen, P.; Ling, C. H.; Masuda, K.; Matsubara, Y.; Muraki, Y.; Namba, S.; Ohnishi, K.; Philpott, L.; Rattenbury, N. J.; Saito, To.; Sullivan, D. J.; Sumi, T.; Suzuki, D.; Tristram, P. J.; Tsurumi, N.; Wada, K.; Yamai, N.; Yock, P. C. M.; Yonehara, A.; Shvartzvald, Y.; Maoz, D.; Kaspi, S.; Friedmann, M.
Source
Science, v345, p46-49, 2014
Subject
Language
Abstract
We detect a cold, terrestrial planet in a binary-star system using gravitational microlensing. The planet has low mass (2 Earth masses) and lies projected at $a_{\perp,ph}$ ~ 0.8 astronomical units (AU) from its host star, similar to the Earth-Sun distance. However, the planet temperature is much lower, T<60 Kelvin, because the host star is only 0.10--0.15 solar masses and therefore more than 400 times less luminous than the Sun. The host is itself orbiting a slightly more massive companion with projected separation $a_{\perp,ch}=$10--15 AU. Straightforward modification of current microlensing search strategies could increase their sensitivity to planets in binary systems. With more detections, such binary-star/planetary systems could place constraints on models of planet formation and evolution. This detection is consistent with such systems being very common.
Comment: Published in Science, Main and supplementary material combined
Comment: Published in Science, Main and supplementary material combined