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Published December 2016 | Submitted + Supplemental Material
Journal Article Open

A substellar companion to Pleiades HII 3441

Abstract

We find a new substellar companion to the Pleiades member star, Pleiades HII 3441, using the Subaru telescope with adaptive optics. The discovery is made as part of the high-contrast imaging survey to search for planetary-mass and substellar companions in the Pleiades and young moving groups. The companion has a projected separation of 0."49 ± 0."02 (66 ± 2 au) and a mass of 68 ± 5 M_J based on three observations in the J-, H-, and Ks-bands. The spectral type is estimated to be M7 (∼2700 K), and thus no methane absorption is detected in the H band. Our Pleiades observations result in the detection of two substellar companions including one previously reported among 20 observed Pleiades stars, and indicate that the fraction of substellar companions in the Pleiades is about 10.0^(+26.1)_(−8.8)% This is consistent with multiplicity studies of both the Pleiades stars and other open clusters.

Additional Information

© The Author 2016. Published by Oxford University Press on behalf of the Astronomical Society of Japan. Revision Received: 22 July 2016; Accepted: 05 August 2016; Advance Access Publication Date: 2016 September 19. The authors recognize and acknowledge the significant cultural role and reverence that the summit of Mauna Kea has always had within the indigenous Hawaiian community. We are most fortunate to have the opportunity to conduct observations from this mountain. We thank the anonymous referee for carefully reading our manuscript and for giving helpful comments. The authors are grateful to David Lafreniére for generously providing the source code for the LOCI algorithm. This publication makes use of VOSA to estimate the primary spectral type, developed under the Spanish Virtual Observatory project supported from the Spanish MICINN through grant AyA2011-24052. This work was partially supported by the Grant-in-Aid for JSPS fellows (Grant Number 25-8826). J.C. was supported by the U.S. National Science Foundation under Award No. 1009203.

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Submitted - 1608.01780v1.pdf

Supplemental Material - psw083_supp.pdf

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August 19, 2023
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