SIMBAD references

2013ApJ...771...42A - Astrophys. J., 771, 42 (2013/July-1)

Two planetary companions around the K7 dwarf GJ 221: a hot super-earth and a candidate in the Sub-Saturn desert range.

ARRIAGADA P., ANGLADA-ESCUDE G., BUTLER R.P., CRANE J.D., SHECTMAN S.A., THOMPSON I., WENDE S. and MINNITI D.

Abstract (from CDS):

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.

Abstract Copyright: ∼

Journal keyword(s): planetary systems - stars: individual (GJ 221, BD-061339)

Simbad objects: 7

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