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A compact system of small planets around a former red-giant star.
Nature 2011; 480(7378):496-9Nat

Abstract

Planets that orbit their parent star at less than about one astronomical unit (1 AU is the Earth-Sun distance) are expected to be engulfed when the star becomes a red giant. Previous observations have revealed the existence of post-red-giant host stars with giant planets orbiting as close as 0.116 AU or with brown dwarf companions in tight orbits, showing that these bodies can survive engulfment. What has remained unclear is whether planets can be dragged deeper into the red-giant envelope without being disrupted and whether the evolution of the parent star itself could be affected. Here we report the presence of two nearly Earth-sized bodies orbiting the post-red-giant, hot B subdwarf star KIC 05807616 at distances of 0.0060 and 0.0076 AU, with orbital periods of 5.7625 and 8.2293 hours, respectively. These bodies probably survived deep immersion in the former red-giant envelope. They may be the dense cores of evaporated giant planets that were transported closer to the star during the engulfment and triggered the mass loss necessary for the formation of the hot B subdwarf, which might also explain how some stars of this type did not form in binary systems.

Authors+Show Affiliations

Université de Toulouse, UPS-OMP, IRAP, F-31400 Toulouse, France. stephane.charpinet@ast.obs-mip.frNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't
Research Support, U.S. Gov't, Non-P.H.S.

Language

eng

PubMed ID

22193103

Citation

Charpinet, S, et al. "A Compact System of Small Planets Around a Former Red-giant Star." Nature, vol. 480, no. 7378, 2011, pp. 496-9.
Charpinet S, Fontaine G, Brassard P, et al. A compact system of small planets around a former red-giant star. Nature. 2011;480(7378):496-9.
Charpinet, S., Fontaine, G., Brassard, P., Green, E. M., Van Grootel, V., Randall, S. K., ... Telting, J. H. (2011). A compact system of small planets around a former red-giant star. Nature, 480(7378), pp. 496-9. doi:10.1038/nature10631.
Charpinet S, et al. A Compact System of Small Planets Around a Former Red-giant Star. Nature. 2011 Dec 21;480(7378):496-9. PubMed PMID: 22193103.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - A compact system of small planets around a former red-giant star. AU - Charpinet,S, AU - Fontaine,G, AU - Brassard,P, AU - Green,E M, AU - Van Grootel,V, AU - Randall,S K, AU - Silvotti,R, AU - Baran,A S, AU - Ostensen,R H, AU - Kawaler,S D, AU - Telting,J H, Y1 - 2011/12/21/ PY - 2011/07/06/received PY - 2011/10/13/accepted PY - 2011/12/24/entrez PY - 2011/12/24/pubmed PY - 2011/12/24/medline SP - 496 EP - 9 JF - Nature JO - Nature VL - 480 IS - 7378 N2 - Planets that orbit their parent star at less than about one astronomical unit (1 AU is the Earth-Sun distance) are expected to be engulfed when the star becomes a red giant. Previous observations have revealed the existence of post-red-giant host stars with giant planets orbiting as close as 0.116 AU or with brown dwarf companions in tight orbits, showing that these bodies can survive engulfment. What has remained unclear is whether planets can be dragged deeper into the red-giant envelope without being disrupted and whether the evolution of the parent star itself could be affected. Here we report the presence of two nearly Earth-sized bodies orbiting the post-red-giant, hot B subdwarf star KIC 05807616 at distances of 0.0060 and 0.0076 AU, with orbital periods of 5.7625 and 8.2293 hours, respectively. These bodies probably survived deep immersion in the former red-giant envelope. They may be the dense cores of evaporated giant planets that were transported closer to the star during the engulfment and triggered the mass loss necessary for the formation of the hot B subdwarf, which might also explain how some stars of this type did not form in binary systems. SN - 1476-4687 UR - https://www.unboundmedicine.com/medline/citation/22193103/A_compact_system_of_small_planets_around_a_former_red_giant_star_ L2 - https://doi.org/10.1038/nature10631 DB - PRIME DP - Unbound Medicine ER -