Revisiting ρ1 Cancri e: a new mass determination of the transiting super-earth
Article
Article Title | Revisiting ρ1 Cancri e: a new mass determination of the transiting super-earth |
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ERA Journal ID | 1057 |
Article Category | Article |
Authors | Endl, Michael (Author), Robertson, Paul (Author), Cochran, William D. (Author), MacQueen, Phillip J. (Author), Brugamyer, Erik J. (Author), Caldwell, Caroline (Author), Wittenmyer, Robert A. (Author), Barnes, Stuart I. (Author) and Gullikson, Kevin (Author) |
Journal Title | The Astrophysical Journal: an international review of astronomy and astronomical physics |
Journal Citation | 759 (1), pp. 1-7 |
Article Number | 19 |
Number of Pages | 7 |
Year | 2012 |
Publisher | IOP Publishing |
Place of Publication | United States |
ISSN | 0004-637X |
1538-4357 | |
Digital Object Identifier (DOI) | https://doi.org/10.1088/0004-637X/759/1/19 |
Web Address (URL) | http://iopscience.iop.org/article/10.1088/0004-637X/759/1/19 |
Abstract | We present a mass determination for the transiting super-Earth ρ1 Cancri e based on nearly 700 precise radial velocity (RV) measurements. This extensive RV data set consists of data collected by the McDonald Observatory planet search and published data from Lick and Keck observatories. We obtained 212 RV measurements with the Tull Coudé Spectrograph at the Harlan J. Smith 2.7m Telescope and combined them with a new Doppler reduction of the 131 spectra that we have taken in 2003-2004 with the High-Resolution Spectrograph (HRS) at the Hobby-Eberly Telescope for the original discovery of ρ1 Cancri e. Using this large data set we obtain a five-planet Keplerian orbital solution for the system and measure an RV semi-amplitude of K = 6.29 ± 0.21ms-1 for ρ1 Cnc e and determine a mass of 8.37 ±0.38 M⊕. The uncertainty in mass is thus less than 5%. This planet was previously found to transit its parent star, which allowed them to estimate its radius. Combined with the latest radius estimate from Gillon et al., we obtain a mean density of ρ = 4.50 ± 0.20gcm-3. The location of ρ1 Cnc e in the mass-radius diagram suggests that the planet contains a significant amount of volatiles, possibly a water-rich envelope surrounding a rocky core. |
Keywords | planetary systems; techniques - radial velocities; |
Contains Sensitive Content | Does not contain sensitive content |
ANZSRC Field of Research 2020 | 510109. Stellar astronomy and planetary systems |
Public Notes | For access to this article, please click on the URL link provided. |
Institution of Origin | University of Southern Queensland |
Byline Affiliations | University of Texas at Austin, United States |
University of New South Wales |
https://research.usq.edu.au/item/q41v8/revisiting-1-cancri-e-a-new-mass-determination-of-the-transiting-super-earth
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