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: Article

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 originalEnglish
Número de artículo42
PublicaciónAstrophysical Journal
Volumen771
N.º1
DOI
EstadoPublished - 1 jul 2013

Huella dactilar

deserts
Saturn
desert
planets
planet
falling
metallicity
sun
calibration
orbits
trends

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

Citar esto

Arriagada, Pamela ; Anglada-Escudé, Guillem ; Butler, R. Paul ; Crane, Jeffrey D. ; Shectman, Stephen A. ; Thompson, Ian ; Wende, Sebastian ; Minniti, Dante. / Two planetary companions around the K7 dwarf GJ 221 : A hot super-earth and a candidate in the sub-saturn desert range. En: Astrophysical Journal. 2013 ; Vol. 771, N.º 1.
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abstract = "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.",
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Two planetary companions around the K7 dwarf GJ 221 : A hot super-earth and a candidate in the sub-saturn desert range. / Arriagada, Pamela; Anglada-Escudé, Guillem; Butler, R. Paul; Crane, Jeffrey D.; Shectman, Stephen A.; Thompson, Ian; Wende, Sebastian; Minniti, Dante.

En: Astrophysical Journal, Vol. 771, N.º 1, 42, 01.07.2013.

Resultado de la investigación: Article

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AU - Arriagada, Pamela

AU - Anglada-Escudé, Guillem

AU - Butler, R. Paul

AU - Crane, Jeffrey D.

AU - Shectman, Stephen A.

AU - Thompson, Ian

AU - Wende, Sebastian

AU - Minniti, Dante

PY - 2013/7/1

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