Search Publications
The Habitable Zone Planet Finder Reveals a High Mass and Low Obliquity for the Young Neptune K2-25b
Mahadevan, Suvrath; Terrien, Ryan; Wisniewski, John +27 more
Using radial velocity data from the Habitable Zone Planet Finder, we have measured the mass of the Neptune-sized planet K2-25b, as well as the obliquity of its M4.5 dwarf host star in the 600-800 Myr Hyades cluster. This is one of the youngest planetary systems for which both of these quantities have been measured and one of the very few M dwarfs …
Large-scale Structures in the CANDELS Fields: The Role of the Environment in Star Formation Activity
Papovich, Casey; Ferguson, Henry C.; Giavalisco, Mauro +14 more
We present a robust method, weighted von Mises kernel density estimation, along with boundary correction to reconstruct the underlying number density field of galaxies. We apply this method to galaxies brighter than Hubble Space Telescope $/{\rm{F}}160{\rm{w}}\leqslant 26$ AB mag in the redshift range 0.4 ≤ z ≤ 5 in the five CANDELS fields (GOODS-…
Temperatures and Metallicities of M Dwarfs in the APOGEE Survey
Hogg, David W.; Mann, Andrew W.; Burgasser, Adam +1 more
M dwarfs have enormous potential for our understanding of structure and formation on both Galactic and exoplanetary scales through their properties and compositions. However, current atmosphere models have limited ability to reproduce spectral features in stars at the coolest temperatures (Teff < 4200 K) and to fully exploit the info…
Carbon star formation as seen through the non-monotonic initial-final mass relation
Ramirez-Ruiz, Enrico; Girardi, Léo; Cheng, Sihao +13 more
The initial-final mass relation (IFMR) links the birth mass of a star to the mass of the compact remnant left at its death. While the relevance of the IFMR across astrophysics is universally acknowledged, not all of its fine details have yet been resolved. A new analysis of a few carbon-oxygen white dwarfs in old open clusters of the Milky Way led…
Infrared detection of aliphatic organics on a cometary nucleus
Bellucci, G.; Carlson, R. W.; Fornasier, S. +28 more
The European Space Agency's Rosetta mission1 has acquired unprecedented measurements of the surface of the nucleus of comet 67P/Churyumov-Gerasimenko (hereafter, 67P), the composition of which, as determined by in situ and remote-sensing instruments, including the VIRTIS instrument2, seems to be an assemblage of ices, mineral…
Hints on the origins of particle traps in protoplanetary disks given by the Mdust - M⋆ relation
Pascucci, Ilaria; Pinilla, Paola; Marino, Sebastian
Context. Demographic surveys of protoplanetary disks, carried out mainly with the Atacama Large Millimeter/submillimete Array, have provided access to a large range of disk dust masses (Mdust) around stars with different stellar types and in different star-forming regions. These surveys found a power-law relation between Mdust
Ram pressure stripping candidates in the coma cluster: evidence for enhanced star formation
Parker, Laura C.; Roberts, Ian D.
The Coma cluster is the nearest massive (M ≳ 1015 M⊙) galaxy cluster, making it an excellent laboratory to probe the influence of the cluster environment on galaxy star formation. Here, we present a sample of 41 galaxies with disturbed morphologies consistent with ram pressure stripping. These galaxies are identified visually using high…
Exploring Solar Wind Origins and Connecting Plasma Flows from the Parker Solar Probe to 1 au: Nonspherical Source Surface and Alfvénic Fluctuations
D'Amicis, Raffaella; Réville, Victor; Velli, Marco +18 more
The magnetic field measurements of the FIELDS instrument on the Parker Solar Probe (PSP) have shown intensities, throughout its first solar encounter, that require a very low source surface (SS) height ( ${R}_{\mathrm{SS}}\leqslant 1.8\,{R}_{\odot }$ ) to be reconciled with magnetic field measurements at the Sun via potential field extrapolation (…
The First Ultracompact Roche Lobe-Filling Hot Subdwarf Binary
Duev, Dmitry A.; Riddle, Reed; Szkody, Paula +29 more
We report the discovery of the first short-period binary in which a hot subdwarf star (sdOB) filled its Roche lobe and started mass transfer to its companion. The object was discovered as part of a dedicated high-cadence survey of the Galactic plane named the Zwicky Transient Facility and exhibits a period of P = 39.3401(1) minutes, making it the …
How many components? Quantifying the complexity of the metallicity distribution in the Milky Way bulge with APOGEE
Monachesi, Antonela; Cohen, Roger E.; Cunha, Katia +16 more
We use data of ∼13-=000 stars from the Sloan Digital Sky Survey/Apache Point Observatory Galactic Evolution Experiment survey to study the shape of the bulge metallicity distribution function (MDF) within the region |ℓ| ≤ 11° and |b| ≤ 13°, and spatially constrained to RGC ≤ 3.5 kpc. We apply Gaussian mixture modelling and non-negative …