SIMBAD references

2012ApJ...753..171V - Astrophys. J., 753, 171 (2012/July-2)

The GJ 436 system: directly determined astrophysical parameters of an M dwarf and implications for the transiting hot Neptune.

VON BRAUN K., BOYAJIAN T.S., KANE S.R., HEBB L., VAN BELLE G.T., FARRINGTON C., CIARDI D.R., KNUTSON H.A., TEN BRUMMELAAR T.A., LOPEZ-MORALES M., McALISTER H.A., SCHAEFER G., RIDGWAY S., COLLIER CAMERON A., GOLDFINGER P.J., TURNER N.H., STURMANN L. and STURMANN J.

Abstract (from CDS):

The late-type dwarf GJ 436 is known to host a transiting Neptune-mass planet in a 2.6 day orbit. We present results of our interferometric measurements to directly determine the stellar diameter (R{sstarf}= 0.455±0.018 R) and effective temperature (TEFF= 3416±54 K). We combine our stellar parameters with literature time-series data, which allows us to calculate physical and orbital system parameters, including GJ 436's stellar mass (M{sstarf}= 0.507+0.071_- 0.062M☉_), stellar density (ρ*= 5.37+0.30_- 0.27ρ☉_), planetary radius (Rp = 0.369+0.015_- 0.015RJupiter_), and planetary mass (Mp= 0.078+0.007 _- 0.008MJupiter_), implying a mean planetary density of ρp= 1.55+0.12_- 0.10ρJupiter_. These values are generally in good agreement with previous literature estimates based on assumed stellar mass and photometric light curve fitting. Finally, we examine the expected phase curves of the hot Neptune GJ 436b, based on various assumptions concerning the efficiency of energy redistribution in the planetary atmosphere, and find that it could be constrained with Spitzer monitoring observations.

Abstract Copyright:

Journal keyword(s): infrared: stars - planetary systems - stars: fundamental parameters, radii, temperatures, luminosities - stars: individual: GJ 436 - stars: late-type - techniques: interferometric

Simbad objects: 8

goto Full paper

goto View the reference in ADS

To bookmark this query, right click on this link: simbad:2012ApJ...753..171V and select 'bookmark this link' or equivalent in the popup menu


2019.10.16-07:47:27

© Université de Strasbourg/CNRS

    • Contact