Synthesizing Exoplanet Demographics from Radial Velocity and Microlensing Surveys, II: The Frequency of Planets Orbiting M Dwarfs

Abstract

In contrast to radial velocity surveys, results from microlensing surveys indicate that giant planets with masses greater than the critical mass for core accretion ($\sim 0.1M_{\mathrm{Jup}}$) are relatively common around low-mass stars. Using the methodology developed in the first paper, we predict the sensitivity of M-dwarf radial velocity (RV) surveys to analogs of the population of planets inferred by microlensing. We find that RV surveys should detect a handful of super-Jovian ($>M_{\mathrm{Jup}}$) planets at the longest periods being probed. These planets are indeed found by RV surveys, implying that the demographic constraints inferred from these two methods are consistent. We combine the results from both methods to estimate planet frequencies spanning wide regions of parameter space. We find that the frequency of Jupiters and super-Jupiters ($1\lesssim m_p\sin i/M_{\mathrm{Jup}}\lesssim 13$) with periods $1\le P/\mathrm{days}\le 10^4$ is $f_{\mathrm{J}}=0.029_{-0.015}^{+0.013}$, a median factor of 4.3 ($1.5-14$ at 95% confidence) smaller than the inferred frequency of such planets around FGK stars of $0.11\pm 0.02$. However, we find the frequency of all giant planets with $30\lesssim m_p\sin i/M_{\oplus }\lesssim 10^4$ and $1\le P/\mathrm{days}\le 10^4$ to be $f_{\mathrm{G}}=0.15_{-0.07}^{+0.06}$, only a median factor of 2.2 ($0.73-5.9$ at 95% confidence) smaller than the inferred frequency of such planets orbiting FGK stars of $0.31\pm 0.07$. For a more conservative definition of giant planets ($50\lesssim m_p\sin i/M_{\oplus }\lesssim 10^4$), we find $f_{{\mathrm{G}}^{\prime }}=0.11\pm 0.05$, a median factor of 2.2 ($0.73-6.7$ at 95% confidence) smaller than that inferred for FGK stars of $0.25\pm 0.05$. Finally, we find the frequency of all planets with $1\le m_p\sin i/M_{\oplus }\le 10^4$ and $1\le P/\mathrm{days}\le 10^4$ to be $f_p=1.9\pm 0.5$.

27 pages, 10 figures, part 2 of a 2-paper series submitted to ApJ. For a brief video summarizing this 2-paper series, please see https://www.youtube.com/watch?v=JbNCWASAjsQ

References in corpus (11)

• The Occurrence and Mass Distribution of Close-in Super-Earths, Neptunes, and Jupiters
• Spectroscopic parameters for 451 stars in the HARPS GTO planet search program. Stellar [Fe/H] and the frequency of exo-Neptunes
• One or more bound planets per Milky Way star from microlensing observations
• Planet formation around stars of various masses: The snow line and the frequency of giant planets
• Microlens OGLE-2005-BLG-169 Implies Cool Neptune-Like Planets are Common
• A New Planet Around an M Dwarf: Revealing a Correlation Between Exoplanets and Stellar Mass
• The Palomar/Keck Adaptive Optics Survey of Young Solar Analogs: Evidence for a Universal Companion Mass Function
• The HARPS search for southern extra-solar planets. XIII. A planetary system with 3 Super-Earths (4.2, 6.9, & 9.2 Earth masses)
• Formation and Evolution of Planetary Systems: Upper Limits to the Gas Mass in Disks Around Sun-like Stars
• A Long-Period Jupiter-Mass Planet Orbiting the Nearby M Dwarf GJ849
• A Systematic Study of the Final Masses of Gas Giant Planets

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