Three planets orbiting Wolf 1061

Wright, D. J. and Wittenmyer, R. A. and Tinney, C. G. and Bentley, J. S. and Zhao, Jinglin (2016) Three planets orbiting Wolf 1061. The Astrophysical Journal Letters, 817 (2). ISSN 2041-8205

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Abstract

We use archival HARPS spectra to detect three planets orbiting the M3 dwarf Wolf 1061 (GJ 628). We detect a 1.36M⊕ minimum-mass planet with an orbital period P = 4.888 days (Wolf 1061b), a 4.25M⊕ minimum-mass planet with orbital period P = 17.867 days (Wolf 1061c), and a likely 5.21M⊕ minimum-mass planet with orbital period P = 67.274 days (Wolf 1061d). All of the planets are of sufficiently low mass that they may be rocky in nature. The 17.867 day planet falls within the habitable zone for Wolf 1061 and the 67.274 day planet falls just outside the outer boundary of the habitable zone. There are no signs of activity observed in the bisector spans, cross-correlation FWHMs, calcium H & K indices, NaD indices, or Hα indices near the planetary periods. We use custom methods to generate a cross-correlation template tailored to the star. The resulting velocities do not suffer the strong annual variation observed in the HARPS DRS velocities. This differential technique should deliver better exploitation of the archival HARPS data for the detection of planets at extremely low amplitudes.


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: Published version made accessible, in accordance with the copyright policy of the publisher.
Faculty / Department / School: Current - Faculty of Health, Engineering and Sciences - School of Agricultural, Computational and Environmental Sciences
Date Deposited: 23 Mar 2017 05:30
Last Modified: 08 Oct 2018 04:41
Uncontrolled Keywords: methods; data analysis; planets and satellites; detection; stars; spectroscopic
Fields of Research : 02 Physical Sciences > 0201 Astronomical and Space Sciences > 020110 Stellar Astronomy and Planetary Systems
Socio-Economic Objective: E Expanding Knowledge > 97 Expanding Knowledge > 970102 Expanding Knowledge in the Physical Sciences
Identification Number or DOI: 10.3847/2041-8205/817/2/L20
URI: http://eprints.usq.edu.au/id/eprint/30651

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