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TESS Hunt for Young and Maturing Exoplanets (THYME): A Planet in the 45 Myr Tucana-Horologium Association
Barclay, Thomas; Vanderburg, Andrew; Hellier, Coel +49 more
Young exoplanets are snapshots of the planetary evolution process. Planets that orbit stars in young associations are particularly important because the age of the planetary system is well constrained. We present the discovery of a transiting planet larger than Neptune but smaller than Saturn in the 45 Myr Tucana-Horologium young moving group. The…
The discovery of weak coherent pulsations in the ultraluminous X-ray source NGC 1313 X-2
Fabian, A. C.; Pinto, C.; Bachetti, M. +8 more
We report the detection of weak pulsations from the archetypal ultraluminous X-ray source (ULX) NGC 1313 X-2. Acceleration searches reveal sinusoidal pulsations in segments of two out of six new deep observations of this object, with a period of ∼1.5 s and a pulsed fraction of ∼ 5 per cent. We use Monte Carlo simulations to demonstrate that the in…
Evolution of the galaxy stellar mass functions and UV luminosity functions at z = 6-9 in the Hubble Frontier Fields
Conselice, Christopher J.; Bhatawdekar, Rachana; Duncan, Kenneth +1 more
We present new measurements of the evolution of the galaxy stellar mass functions (GSMFs) and ultraviolet luminosity functions (UV LFs) for galaxies from z = 6-9 within the Frontier Field cluster MACSJ0416.1-2403 and its parallel field. To obtain these results, we derive the stellar masses of our sample by fitting synthetic stellar population mode…
A planetesimal orbiting within the debris disc around a white dwarf star
Reffert, Sabine; Toonen, Silvia; Villaver, Eva +29 more
Many white dwarf stars show signs of having accreted smaller bodies, implying that they may host planetary systems. A small number of these systems contain gaseous debris discs, visible through emission lines. We report a stable 123.4-minute periodic variation in the strength and shape of the Ca II emission line profiles originating from the debri…
Protoplanetary Disk Rings and Gaps across Ages and Luminosities
Dong, Ruobing; Williams, Jonathan P.; van der Marel, Nienke +2 more
Since the discovery of the multiring structure of the HL Tau disk, ALMA data suggest that the dust continuum emission of many, if not all, protoplanetary disks consists of rings and gaps, no matter their spectral type or age. The origin of these gaps so far remains unclear. We present a sample study of 16 disks with multiple ring-like structures i…
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…