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Title: REVISITING {rho}{sup 1} CANCRI e: A NEW MASS DETERMINATION OF THE TRANSITING SUPER-EARTH

Abstract

We present a mass determination for the transiting super-Earth {rho}{sup 1} 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 Coude Spectrograph at the Harlan J. Smith 2.7 m 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 {rho}{sup 1} 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 {+-} 0.21 m s{sup -1} for {rho}{sup 1} Cnc e and determine a mass of 8.37 {+-} 0.38 M {sub Circled-Plus }. 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 {rho} = 4.50 {+-} 0.20 g cm{sup -3}. The location of {rho}{sup 1}more » 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.« less

Authors:
; ; ;  [1]; ; ; ;  [2];  [3]
  1. McDonald Observatory, University of Texas at Austin, Austin, TX 78712 (United States)
  2. Department of Astronomy, University of Texas at Austin, Austin, TX 78712 (United States)
  3. Department of Astrophysics and Optics, School of Physics, University of New South Wales, Sydney (Australia)
Publication Date:
OSTI Identifier:
22086487
Resource Type:
Journal Article
Journal Name:
Astrophysical Journal
Additional Journal Information:
Journal Volume: 759; Journal Issue: 1; Other Information: Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0004-637X
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; AMPLITUDES; ASTRONOMY; ASTROPHYSICS; DENSITY; DIAGRAMS; EMISSION SPECTRA; MASS; PLANETS; RADIAL VELOCITY; RESOLUTION; STARS; TELESCOPES; WATER

Citation Formats

Endl, Michael, Cochran, William D., MacQueen, Phillip J., Barnes, Stuart I., Robertson, Paul, Brugamyer, Erik J., Caldwell, Caroline, Gullikson, Kevin, and Wittenmyer, Robert A., E-mail: mike@astro.as.utexas.edu. REVISITING {rho}{sup 1} CANCRI e: A NEW MASS DETERMINATION OF THE TRANSITING SUPER-EARTH. United States: N. p., 2012. Web. doi:10.1088/0004-637X/759/1/19.
Endl, Michael, Cochran, William D., MacQueen, Phillip J., Barnes, Stuart I., Robertson, Paul, Brugamyer, Erik J., Caldwell, Caroline, Gullikson, Kevin, & Wittenmyer, Robert A., E-mail: mike@astro.as.utexas.edu. REVISITING {rho}{sup 1} CANCRI e: A NEW MASS DETERMINATION OF THE TRANSITING SUPER-EARTH. United States. doi:10.1088/0004-637X/759/1/19.
Endl, Michael, Cochran, William D., MacQueen, Phillip J., Barnes, Stuart I., Robertson, Paul, Brugamyer, Erik J., Caldwell, Caroline, Gullikson, Kevin, and Wittenmyer, Robert A., E-mail: mike@astro.as.utexas.edu. Thu . "REVISITING {rho}{sup 1} CANCRI e: A NEW MASS DETERMINATION OF THE TRANSITING SUPER-EARTH". United States. doi:10.1088/0004-637X/759/1/19.
@article{osti_22086487,
title = {REVISITING {rho}{sup 1} CANCRI e: A NEW MASS DETERMINATION OF THE TRANSITING SUPER-EARTH},
author = {Endl, Michael and Cochran, William D. and MacQueen, Phillip J. and Barnes, Stuart I. and Robertson, Paul and Brugamyer, Erik J. and Caldwell, Caroline and Gullikson, Kevin and Wittenmyer, Robert A., E-mail: mike@astro.as.utexas.edu},
abstractNote = {We present a mass determination for the transiting super-Earth {rho}{sup 1} 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 Coude Spectrograph at the Harlan J. Smith 2.7 m 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 {rho}{sup 1} 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 {+-} 0.21 m s{sup -1} for {rho}{sup 1} Cnc e and determine a mass of 8.37 {+-} 0.38 M {sub Circled-Plus }. 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 {rho} = 4.50 {+-} 0.20 g cm{sup -3}. The location of {rho}{sup 1} 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.},
doi = {10.1088/0004-637X/759/1/19},
journal = {Astrophysical Journal},
issn = {0004-637X},
number = 1,
volume = 759,
place = {United States},
year = {2012},
month = {11}
}