Search Publications
Another Superdense Sub-Neptune in K2-182 b and Refined Mass Measurements for K2-199 b and c
Batalha, Natalie M.; Rosenthal, Lee J.; Hirsch, Lea A. +10 more
We combine multiple campaigns of K2 photometry with precision radial velocity measurements from Keck-HIRES to measure the masses of three sub-Neptune-sized planets. We confirm the planetary nature of the massive sub-Neptune K2-182 b (P b = 4.7 days, R b = 2.69 R ⊕) and derive refined parameters for K2-199 b and c (…
Frequencies, chaos, and resonances: A study of orbital parameters of nearby thick-disc and halo stars
Helmi, Amina; Koppelman, Helmer H.; Hagen, Jorrit H. J.
Aims: We study the distribution of nearby thick-disc and halo stars in subspaces defined by their characteristic orbital parameters. Our aim is to establish the origin of the structure reported in particular in the Rmax - zmax space.
Methods: To this end, we computed the orbital parameters and frequencies of stars f…
The Extinction and Distance of the MBM Molecular Clouds at High Galactic Latitude
Ren, Yi; Jiang, Biwei; Zhao, He +1 more
Based on the accurate color excess {E}_{{{\rm{G}}}_{\mathrm{BP}},{{\rm{G}}}_{\mathrm{RP}}}$ of more than 4 million stars and the {E}_{\mathrm{NUV},{{\rm{G}}}_{\mathrm{BP}}}$ of more than 1 million stars from Sun et al., the distance and extinction of the molecular clouds (MCs) in the Magnani-Blitz-Mundy catalog at ∣b∣ > 20° are studied in combi…
Extended envelopes around Galactic Cepheids. V. Multi-wavelength and time-dependent analysis of IR excess
Kervella, P.; Mérand, A.; Lagadec, E. +6 more
Aims: We aim to investigate the infrared excess of 45 Milky Way (MW) Cepheids combining different observables in order to constrain the presence of circumstellar envelopes (CSEs).
Methods: We used the SpectroPhoto-Interferometry of Pulsating Stars (SPIPS) algorithm, a robust implementation of the parallax-of-pulsation method that combine…
Gamma-ray and Neutrino Signals from Accretion Disk Coronae of Active Galactic Nuclei
Inoue, Yoshiyuki; Doi, Akihiro; Khangulyan, Dmitry
To explain the X-ray spectra of active galactic nuclei (AGN), non-thermal activity in AGN coronae such as pair cascade models has been extensively discussed in the past literature. Although X-ray and gamma-ray observations in the 1990s disfavored such pair cascade models, recent millimeter-wave observations of nearby Seyferts have established the …
The K2 M67 Study: Precise Mass for a Turnoff Star in the Old Open Cluster M67
Vanderburg, Andrew; Latham, David W.; Stello, Dennis +8 more
We present a study of the bright detached eclipsing main-sequence binary WOCS 11028 (Sanders 617) in the open cluster M67. Although the binary has only one eclipse per orbital cycle, we show that the masses of the stars can be derived very precisely thanks to a strong constraint on the orbital inclination: MA = 1.222 ± 0.006M⊙
Analysis of the Unconcentrated Background of the EPIC pn Camera on Board XMM-Newton
Esposito, Paolo; Tiengo, Andrea; De Luca, Andrea +8 more
Our understanding of the background of the EPIC/pn camera on board XMM-Newton is incomplete. This affects the study of extended sources and can influence the predictions of the expected background of future X-ray missions, such as the Advanced Telescope for High Energy Astrophysics (ATHENA). Here we provide new results based on the analysis of the…
Search for candidate strongly lensed dusty galaxies in the Planck satellite catalogues
Burigana, C.; Herranz, D.; Trombetti, T. +5 more
The shallow, all-sky Planck surveys at sub-millimetre wavelengths have detected the brightest strongly gravitationally lensed dusty galaxies in the sky. The combination of their extreme gravitational flux-boosting and image-stretching offers the unique possibility of measuring in extraordinary detail the galaxy structure and kinematics in early ev…
The role of gas kinematics in setting metallicity gradients at high redshift
Federrath, Christoph; Krumholz, Mark R.; Wisnioski, Emily +1 more
In this work, we explore the diversity of ionized gas kinematics (rotational velocity vϕ and velocity dispersion σg) and gas-phase metallicity gradients at 0.1 ≤ z ≤ 2.5 using a compiled data set of 74 galaxies resolved with ground-based integral field spectroscopy. We find that galaxies with the highest and the lowest σ…
Water and deuterium-to-hydrogen ratio in comets
Fulle, Marco
Recent models find that nuclei of comets are a mixture of water-rich and water-poor cm-sized pebbles. We aim to fit the correlation of the deuterium-to-hydrogen ratio, D/H, with the nucleus active area fraction. Pebble parameters, constrained by the Rosetta mission data, depend on where pebbles accreted in the protoplanetary disc. The diversity of…