Table 1
Basic data for the star 55 Cnc, relevant results of our MCMC analysis of the RVs, and description of the data (RVs + warm Spitzer observations) used in this work.
| Star | 55 Cnc |
|
|
|
| Distance d [parsec] | 12.34 ± 0.121 |
| V magnitude | 5.96 ± 0.012 |
| K magnitude | 4.02 ± 0.033 |
| Spectral type | K0V − G8V4 |
| Effective temperature Teff[K] | 5234 ± 305 |
| Surface gravity log g | 4.45 ± 0.085 |
| Metallicity Fe/H [dex] | + 0.31 ± 0.045 |
| Mass M∗ [M⊙] | 0.905 ± 0.0156 |
| Radius R∗ [R⊙] | 0.943 ± 0.0106 |
|
|
|
| RV data | |
|
|
|
| 250 Lick4 | |
| 70 Keck4 | |
| 119 HET7 | |
| 48 ELODIE8 | |
|
|
|
| Planet (MCMC results) | 55 Cnc e |
|
|
|
| Minimal Mass Mpsini [M⊕] | 7.80 ± 0.56 |
| Expected Radius Rp [R⊕]a | 1.3−5.7 |
| Expected Area ratio (Rp/R∗)2 [ppm] | 150−3000 |
| Equilibrium temperature Teq [K]b | 1958 ± 15 |
| Ttransit−2 450 000 [HJD] | 5568.011 ± 0.025 |
| Toccultation−2 450 000 [HJD] | 5568.368 ± 0.030 |
| Orbital period P [d] | 0.7365437 ± 0.0000052 |
| Central transit duration Wb = 0 [min] | 98 ± 2 |
| RV semi-amplitude K [m s-1] | 5.93 ± 0.42 |
| Semi-major axis a [AU] | 0.01544 ± 0.00009 |
| Eccentricity e |
|
| Argument of periastron ω [deg] |
|
| Prior transit probability [%] | 28.9 ± 1.5 |
| Prior occultation probability [%] | 29.3 ± 1.8 |
|
|
|
| Warm Spitzer data | |
|
|
|
| Channel [μm] | 4.5 |
| AORc | 39524608 |
| Exposure time [s] | 0.01 |
| N BCD d | 5240 |
| Duration [h] | 5 |
References. 1 Van Leeuwen (2007). 2 Turon et al. (1993). 3 Skrutskie et al. (2006). 4 Fischer et al. (2008). 5 Valenti & Fischer (2005). 6 von Braun et al. (2011). 7 Mac Arthur et al. (2004). 8 Naef et al. (2004).
Notes. a Assuming Mpsini = Mp. The minimum and maximum values correspond, respectively, to a pure iron and a pure hydrogen planet (Seager et al. 2007). b Assuming a null albedo and a heat distribution factor f′ = 1/4 (Seager 2010). c AOR = Astronomical Observation Request = Spitzer observing sequence. d BCD = Basic Calibrated Data = block of 64 subarray exposures.
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