Detection of a Neptune-Mass Planet in the ρ1 Cancri System Using the Hobby-Eberly Telescope

By B. Mcarthur, M. Endl, W. Cochran, G. Benedict, Debra A. Fischer, G. Marcy, R. P. Butler, D. Naef, M. Mayor, D. Queloz and 2 more. 2004

279 citations recorded by the source corpus.

We report the detection of the lowest mass extrasolar planet yet found around a Sun-like star—a planet with an M sin i of only 14.21 ± 2.91 M⊕ in an extremely short period orbit (P = 2.808 days) around ρ1 Cancri, a planetary system that already has three known planets. Velocities taken from late 2003-2004 at McDonald Observatory with the Hobby-Eberly Telescope revealed this inner planet at 0.04 AU. We estimate an inclination of the outer planet ρ1 Cancri d, based on Hubble Space Telescope Fine Guidance Sensor measurements that suggest an inner planet of only 17.7 ± 5.57 M⊕, if coplanarity is assumed for the system.

Subfields: Astronomy and Astrophysics

View Paper: https://www.semanticscholar.org/paper/04c40970032723ed07033fb24d16c12f5c3403b4

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In Astronomy and Astrophysics

1. J. Johnson
2. Jon Fortney
3. J. Southworth
4. G. Marcy
5. J. Winn
6. C. Mordasini
7. M. Perryman
8. Debra A. Fischer

Citations in the corpus

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