Search Publications
Direct Detection of Hawking Radiation from Asteroid-Mass Primordial Black Holes
Profumo, Stefano; Coogan, Adam; Morrison, Logan
Light, asteroid-mass primordial black holes, with lifetimes in the range between hundreds to several millions times the age of the Universe, are well-motivated candidates for the cosmological dark matter. Using archival COMPTEL data, we improve over current constraints on the allowed parameter space of primordial black holes as dark matter by stud…
New constraints on the 12CO(2-1)/(1-0) line ratio across nearby disc galaxies
Schinnerer, E.; Leroy, A. K.; Bigiel, F. +18 more
Both the CO(2-1) and CO(1-0) lines are used to trace the mass of molecular gas in galaxies. Translating the molecular gas mass estimates between studies using different lines requires a good understanding of the behaviour of the CO(2-1)-to-CO(1-0) ratio, R21. We compare new, high-quality CO(1-0) data from the IRAM 30-m EMIR MultiLine Pr…
A diffuse core in Saturn revealed by ring seismology
Fuller, Jim; Mankovich, Christopher R.
The best constraints on the internal structures of giant planets have historically originated from measurements of their gravity fields1-3. These data are inherently mostly sensitive to a planet's outer regions, stymieing efforts to measure the mass and compactness of the cores of Jupiter2,4,5 and Saturn6,7. Howeve…
The infrared-radio correlation of star-forming galaxies is strongly M⋆-dependent but nearly redshift-invariant since z ∼ 4
Prandoni, I.; Daddi, E.; Elbaz, D. +25 more
Over the past decade, several works have used the ratio between total (rest 8−1000 µm) infrared and radio (rest 1.4 GHz) luminosity in star-forming galaxies (qIR), often referred to as the infrared-radio correlation (IRRC), to calibrate the radio emission as a star formation rate (SFR) indicator. Previous studies constrained the e…
The 10 parsec sample in the Gaia era
Caballero, J. A.; Sozzetti, A.; Reylé, C. +3 more
Context. The nearest stars provide a fundamental constraint for our understanding of stellar physics and the Galaxy. The nearby sample serves as an anchor where all objects can be seen and understood with precise data. This work is triggered by the most recent data release of the astrometric space mission Gaia and uses its unprecedented high preci…
Masses and compositions of three small planets orbiting the nearby M dwarf L231-32 (TOI-270) and the M dwarf radius valley
Bouchy, F.; Fridlund, M.; Zapatero Osorio, M. R. +69 more
We report on precise Doppler measurements of L231-32 (TOI-270), a nearby M dwarf (d = 22 pc, M⋆ = 0.39 M⊙, R⋆ = 0.38 R⊙), which hosts three transiting planets that were recently discovered using data from the Transiting Exoplanet Survey Satellite (TESS). The three planets are 1.2, 2.4, and 2.1 times the …
Observational Constraints on the Physical Properties of Interstellar Dust in the Post-Planck Era
Draine, B. T.; Hensley, Brandon S.
We present a synthesis of the astronomical observations constraining the wavelength-dependent extinction, emission, and polarization from interstellar dust from UV to microwave wavelengths on diffuse Galactic sight lines. Representative solid-phase abundances for those sight lines are also derived. Given the sensitive new observations of polarized…
Near future MeV telescopes can discover asteroid-mass primordial black hole dark matter
Muñoz, Julian B.; Ray, Anupam; Laha, Ranjan +1 more
Primordial black holes (PBHs), formed out of large overdensities in the early Universe, are a viable dark matter (DM) candidate over a broad range of masses. Ultralight, asteroid-mass PBHs with masses around 1017 g are particularly interesting as current observations allow them to constitute the entire DM density. PBHs in this mass rang…
New Observational Constraints on the Winds of M dwarf Stars
Redfield, Seth; Drake, Jeremy J.; Youngblood, Allison +8 more
High-resolution UV spectra of stellar H I Lyα lines from the Hubble Space Telescope (HST) provide observational constraints on the winds of coronal main-sequence stars, thanks to an astrospheric absorption signature created by the interaction between the stellar winds and the interstellar medium. We report the results of a new HST survey of M dwar…
Radiation Hydrodynamics of Turbulent H II Regions in Molecular Clouds: A Physical Origin of LyC Leakage and the Associated Lyα Spectra
Kakiichi, Koki; Gronke, Max
We examine Lyman continuum (LyC) leakage through H II regions regulated by turbulence and radiative feedback in a giant molecular cloud in the context of fully coupled radiation hydrodynamics (RHD). The physical relations of the LyC escape with H I covering fraction, kinematics, ionizing photon production efficiency, and emergent Lyα line profiles…