Two planetary companions around the K7 dwarf GJ 221: A hot super-earth and a candidate in the sub-saturn desert range

Pamela Arriagada, Guillem Anglada-Escudé, R. Paul Butler, Jeffrey D. Crane, Stephen A. Shectman, Ian Thompson, Sebastian Wende, Dante Minniti

Resultado de la investigación: Contribución a una revistaArtículo

7 Citas (Scopus)

Resumen

We report two low-mass companions orbiting the nearby K7 dwarf GJ 221 that have emerged from reanalyzing 4.4 yr of publicly available HARPS spectra complemented with 2 years of high-precision Doppler measurements with Magellan/PFS. The HARPS measurements alone contain the clear signal of a low-mass companion with a period of 125 days and a minimum mass of 53.2 M (GJ 221b), falling in a mass range where very few planet candidates have been found (sub-Saturn desert). The addition of 17 PFS observations allows the confident detection of a second low-mass companion (6.5 M ) in a hot orbit (3.87 day period, GJ 221c). Spectroscopic and photometric calibrations suggest that GJ 221 is slightly depleted ([Fe/H] ∼ -0.1) compared to the Sun, so the presence of two low-mass companions in the system confirms the trend that slightly reduced stellar metallicity does not prevent the formation of planets in the super-Earth to sub-Saturn mass regime.

Idioma originalInglés
Número de artículo42
PublicaciónAstrophysical Journal
Volumen771
N.º1
DOI
EstadoPublicada - 1 jul 2013

Áreas temáticas de ASJC Scopus

  • Astronomía y astrofísica
  • Ciencias planetarias y espacial

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    Arriagada, P., Anglada-Escudé, G., Butler, R. P., Crane, J. D., Shectman, S. A., Thompson, I., Wende, S., & Minniti, D. (2013). Two planetary companions around the K7 dwarf GJ 221: A hot super-earth and a candidate in the sub-saturn desert range. Astrophysical Journal, 771(1), [42]. https://doi.org/10.1088/0004-637X/771/1/42