Search Publications
A distance of 13 Mpc resolves the claimed anomalies of the galaxy lacking dark matter
Beasley, Michael A.; Borlaff, Alejandro; Vazdekis, Alexandre +10 more
The claimed detection of a diffuse galaxy lacking dark matter represents a possible challenge to our understanding of the properties of these galaxies and galaxy formation in general. The galaxy, already identified in photographic plates taken in the summer of 1976 at the UK 48-in Schmidt telescope, presents normal distance-independent properties …
Highly structured disk around the planet host PDS 70 revealed by high-angular resolution observations with ALMA
Liu, Y.; Henning, T.; van Boekel, R. +19 more
Context. Imaged in the gap of a transition disk and found at a separation of about 195 mas ( 22 au) from its host star at a position angle of about 155°, PDS 70 b is the most robustly detected young planet to date. This system is therefore a unique laboratory for characterizing the properties of young planetary systems at the stage of their format…
The CARMENES search for exoplanets around M dwarfs. Two temperate Earth-mass planet candidates around Teegarden's Star
Schmitt, J. H. M. M.; Rebolo, R.; del Burgo, C. +180 more
Context. Teegarden's Star is the brightest and one of the nearest ultra-cool dwarfs in the solar neighbourhood. For its late spectral type (M7.0 V), the star shows relatively little activity and is a prime target for near-infrared radial velocity surveys such as CARMENES.
Aims: As part of the CARMENES search for exoplanets around M dwarfs, we…
TESS Discovery of an Ultra-short-period Planet around the Nearby M Dwarf LHS 3844
Deming, Drake; Torres, Guillermo; Vanderburg, Andrew +70 more
Data from the newly commissioned Transiting Exoplanet Survey Satellite has revealed a “hot Earth” around LHS 3844, an M dwarf located 15 pc away. The planet has a radius of 1.303+/- 0.022 R ⊕ and orbits the star every 11 hr. Although the existence of an atmosphere around such a strongly irradiated planet is questionable, the star is bri…
Hydrostatic mass profiles in X-COP galaxy clusters
Pointecouteau, E.; Rossetti, M.; Gastaldello, F. +7 more
Aims: We present the reconstruction of hydrostatic mass profiles in 13 X-ray luminous galaxy clusters that have been mapped in their X-ray and Sunyaev-Zeldovich (SZ) signals out to R200 for the XMM-Newton Cluster Outskirts Project (X-COP).
Methods: Using profiles of the gas temperature, density, and pressure that have been spa…
ALMA Reveals Potential Evidence for Spiral Arms, Bars, and Rings in High-redshift Submillimeter Galaxies
Smail, I.; Menten, K. M.; Brandt, W. N. +19 more
We present subkiloparsec-scale mapping of the 870 µm ALMA continuum emission in six luminous (L IR ∼ 5 × 1012 L ⊙) submillimeter galaxies (SMGs) from the ALESS survey of the Extended Chandra Deep Field South. Our high-fidelity 0.″07-resolution imaging (∼500 pc) reveals robust evidence for structures with deco…
Mapping the Stellar Halo with the H3 Spectroscopic Survey
Conroy, Charlie; Johnson, Benjamin D.; Berlind, Perry +12 more
Modern theories of galaxy formation predict that the Galactic stellar halo was hierarchically assembled from the accretion and disruption of smaller systems. This hierarchical assembly is expected to produce a high degree of structure in the combined phase and chemistry space; this structure should provide a relatively direct probe of the accretio…
General relativistic orbital decay in a seven-minute-orbital-period eclipsing binary system
Kulkarni, S. R.; Duev, Dmitry A.; Riddle, Reed +23 more
General relativity1 predicts that short-orbital-period binaries emit considerable amounts of gravitational radiation. The upcoming Laser Interferometer Space Antenna2 (LISA) is expected to detect tens of thousands of such systems3 but few have been identified4, of which only one5 is eclipsing—…
New constraints on sterile neutrino dark matter from NuSTAR M31 observations
Wik, Daniel R.; Krivonos, Roman; Beacom, John F. +4 more
We use a combined 1.2 Ms of NuSTAR observations of M31 to search for x-ray lines from sterile neutrino dark matter decay. For the first time in a NuSTAR analysis, we consistently take into account the signal contribution from both the focused and unfocused fields of view. We also reduce the modeling systematic uncertainty by performing spectral fi…
Half-mass Radii for ∼7000 Galaxies at 1.0 ≤ z ≤ 2.5: Most of the Evolution in the Mass-Size Relation Is Due to Color Gradients
Barro, Guillermo; Kriek, Mariska; Price, Sedona H. +1 more
Radial mass-to-light ratio gradients cause the half-mass and half-light radii of galaxies to differ, potentially biasing studies that use half-light radii. Here we present the largest catalog to date of galaxy half-mass radii at z > 1: 7006 galaxies in the CANDELS fields at 1.0 ≤ z ≤ 2.5. The sample includes both star-forming and quiescent gala…