The GAPS Programme with HARPS-N@TNG VI: The Curious Case of TrES-4b

摘要: We revisit the TrES-4 system parameters based on high-precision HARPS-N radial-velocity measurements and new photometric light curves. A combined spectroscopic analysis allows us to determine a orbit with an amplitude $K=51\pm3$ m s$^{-1}$. The derived mass of TrES-4b is found be $M_{\rm p} = 0.49\pm0.04 \rm M_{Jup}$, significantly lower than previously reported. Combined large radius ($R_{\rm 1.84_{-0.09}^{+0.08} R_{Jup}$) inferred from our analysis, becomes second-lowest density transiting hot Jupiter known. discuss several scenarios explain puzzling discrepancy in context exotic class highly inflated giant planets.