Search Publications
Structure and elastic parameters of the near surface of Abydos site on comet 67P/Churyumov-Gerasimenko, as obtained by SESAME/CASSE listening to the MUPUS insertion phase
Knollenberg, J.; Knapmeyer, M.; Fischer, H. -H. +5 more
The accelerometers of the SESAME/CASSE instrument aboard Rosetta's lander Philae recorded surface waves produced during the MUPUS hammering phase. After presenting evidence that all feet of Philae were in contact with the ground, we analyze group arrival time differences between the three feet of Philae and obtain a Rayleigh wave velocity between …
CO excitation in the Seyfert galaxy NGC 34: stars, shock or AGN driven?
Cimatti, A.; Pozzi, F.; Massardi, M. +7 more
We present a detailed analysis of the X-ray and molecular gas emission in the nearby galaxy NGC 34, to constrain the properties of molecular gas, and assess whether, and to what extent, the radiation produced by the accretion on to the central black hole affects the CO line emission. We analyse the CO spectral line energy distribution (SLED) as re…
Prediction of Supernova Rates in Known Galaxy-Galaxy Strong-lens Systems
Kang, Xi; Mao, Shude; Bolton, Adam S. +3 more
We propose a new strategy of finding strongly lensed supernovae (SNe) by monitoring known galaxy-scale strong-lens systems. Strongly lensed SNe are potentially powerful tools for the study of cosmology, galaxy evolution, and stellar populations, but they are extremely rare. By targeting known strongly lensed star-forming galaxies, our strategy sig…
Precise radial velocities of giant stars. X. Bayesian stellar parameters and evolutionary stages for 372 giant stars from the Lick planet search
Stock, Stephan; Reffert, Sabine; Quirrenbach, Andreas
Context. The determination of accurate stellar parameters of giant stars is essential for our understanding of such stars in general and as exoplanet host stars in particular. Precise stellar masses are vital for determining the lower mass limit of potential substellar companions with the radial velocity method, but also for dynamical modeling of …
High-time-resolution Photometry of AR Scorpii: Confirmation of the White Dwarf’s Spin-down
Garnavich, Peter; Littlefield, Colin; Myers, Gordon +3 more
The unique binary AR Scorpii consists of an asynchronously rotating, magnetized white dwarf (WD) that interacts with its red-dwarf companion to produce a large-amplitude, highly coherent pulsation every 1.97 minutes. Over the course of two years, we obtained 39 hours of time-resolved, optical photometry of AR Sco at a typical cadence of 5 s to stu…
Sun-to-earth propagation of the 2015 June 21 coronal mass ejection revealed by optical, EUV, and radio observations
Gopalswamy, N.; Yashiro, S.; Mäkelä, P. +3 more
We investigate the propagation of the 2015 June 21 CME-driven shock as revealed by the type II bursts at metric and longer wavelengths and coronagraph observations. The CME was associated with the second largest geomagnetic storm of solar cycle 24 and a large solar energetic particle (SEP) event. The eruption consisted of two M-class flares, with …
Physical Properties of II Zw 40's Super Star Cluster and Nebula: New Insights and Puzzles from UV Spectroscopy
Leitherer, Claus; Lee, Janice C.; Levesque, Emily M. +1 more
We analyze far-ultraviolet spectra and ancillary data of the super star cluster SSC-N and its surrounding H II region in the nearby dwarf galaxy II Zw 40. From the ultraviolet spectrum, we derive a low internal reddening of E(B - V) = 0.07 ± 0.03, a mass of (9.1 ± 1.0) × 105 M ⊙, a bolometric luminosity of (1.1 ± 0.1) × 10
An analysis of the geodesy and relativity experiments of BepiColombo
Iess, Luciano; Imperi, Luigi; Mariani, Mirco J.
BepiColombo is a ESA-JAXA mission aimed to a comprehensive exploration of Mercury, the innermost planet of the solar system. The Mercury Orbiter Radio science Experiment (MORE) will exploit a state of the art microwave tracking system, including an advanced Ka-band transponder, to determine the gravity field and the rotational state of the planet,…
The Arcminute Microkelvin Imager catalogue of gamma-ray burst afterglows at 15.7 GHz
Wijers, R. A. M. J.; Fender, R. P.; van der Horst, A. J. +7 more
We present the Arcminute Microkelvin Imager (AMI) Large Array catalogue of 139 gamma-ray bursts (GRBs). AMI observes at a central frequency of 15.7 GHz and is equipped with a fully automated rapid-response mode, which enables the telescope to respond to high-energy transients detected by Swift. On receiving a transient alert, AMI can be on-target …
Chemically Dissected Rotation Curves of the Galactic Bulge from Main-sequence Proper Motions
Brown, Thomas M.; Gennaro, Mario; Clarkson, William I. +9 more
We report results from an exploratory study implementing a new probe of Galactic evolution using archival Hubble Space Telescope imaging observations. Precise proper motions are combined with photometric relative metallicity and temperature indices, to produce the proper-motion rotation curves of the Galactic bulge separately for metal-poor and me…