Search Publications
CMZoom: Survey Overview and First Data Release
Ho, Luis C.; Ott, Jürgen; Lu, Xing +19 more
We present an overview of the CMZoom survey and its first data release. CMZoom is the first blind, high-resolution survey of the Central Molecular Zone (CMZ; the inner 500 pc of the Milky Way) at wavelengths sensitive to the pre-cursors of high-mass stars. CMZoom is a 550 hr Large Program on the Submillimeter Array that mapped at 1.3 mm all of the…
NGC 6240: A triple nucleus system in the advanced or final state of merging
Kollatschny, W.; Monreal-Ibero, A.; Contini, T. +4 more
Aims: NGC 6240 is a well-studied nearby galaxy system in the process of merging. Based on optical, X-ray, and radio observations, it is thought to harbor two active nuclei. We carried out a detailed optical 3D spectroscopic study to investigate the inner region of this system in connection with existing MERLIN and VLBA data.
Methods: We …
A Panoramic Landscape of the Sagittarius Stream in Gaia DR2 Revealed with the STREAMFINDER Spyglass
Martin, Nicolas; Malhan, Khyati; Siebert, Arnaud +4 more
We present the first full six-dimensional panoramic portrait of the Sagittarius stream, obtained by searching for wide stellar streams in the Gaia DR2 data set with the STREAMFINDER algorithm. We use the kinematic behavior of the sample to devise a selection of Gaia RR Lyrae, providing excellent distance measurements along the stream. The proper m…
Measuring the local dark matter density with LAMOST DR5 and Gaia DR2
Mao, Shude; Liu, Chao; Xue, Xiang-Xiang +3 more
We apply the vertical Jeans equation to the kinematics of Milky Way stars in the solar neighbourhood to measure the local dark matter density. More than 90 000 G- and K-type dwarf stars are selected from the cross-matched sample of LAMOST (Large Sky Area Multi-Object Fibre Spectroscopic Telescope) fifth data release and Gaia second data release fo…
The Philae lander reveals low-strength primitive ice inside cometary boulders
Parker, Joel Wm.; Auster, Hans-Ulrich; Heinisch, Philip +25 more
On 12 November 2014, the Philae lander descended towards comet 67P/Churyumov-Gerasimenko, bounced twice off the surface, then arrived under an overhanging cliff in the Abydos region. The landing process provided insights into the properties of a cometary nucleus1-3. Here we report an investigation of the previously undiscovered site of …
Rotation-activity relations and flares of M dwarfs with K2 long- and short-cadence data
Scholz, A.; Damasso, M.; Stelzer, B. +1 more
Using light curves obtained by the K2 mission, we study the relation between stellar rotation and magnetic activity with special focus on stellar flares. Our sample comprises 56 bright and nearby M dwarfs observed by K2 during campaigns C0-C18 in long- and short-cadence mode. We derive rotation periods for 46 M dwarfs and measure photometric activ…
LEGO - II. A 3 mm molecular line study covering 100 pc of one of the most actively star-forming portions within the Milky Way disc
Weiss, A.; Evans, N. J.; Goldsmith, P. F. +20 more
The current generation of (sub)mm-telescopes has allowed molecular line emission to become a major tool for studying the physical, kinematic, and chemical properties of extragalactic systems, yet exploiting these observations requires a detailed understanding of where emission lines originate within the Milky Way. In this paper, we present 60 arcs…
A Joint Mass-Radius-Period Distribution of Exoplanets
Rogers, Leslie A.; Neil, Andrew R.
The radius-period distribution of exoplanets has been characterized by the Kepler survey, and the empirical mass-radius relation by the subset of Kepler planets with mass measurements. We combine the two in order to constrain the joint mass-radius-period distribution of Kepler transiting planets. We employ hierarchical Bayesian modeling and mixtur…
The Radial Acceleration Relation in CLASH Galaxy Clusters
Donahue, Megan; Umetsu, Keiichi; Chiu, I. -Non +2 more
The radial acceleration relation (RAR) in galaxies describes a tight empirical scaling law between the total acceleration ${g}_{\mathrm{tot}}(r)={{GM}}_{\mathrm{tot}}(\lt r)/{r}^{2}$ observed in galaxies and that expected from their baryonic mass ${g}_{\mathrm{bar}}(r)={{GM}}_{\mathrm{bar}}(\lt r)/{r}^{2}$, with a characteristic acceleration scale…
Planet Hunters TESS I: TOI 813, a subgiant hosting a transiting Saturn-sized planet on an 84-day orbit
Aigrain, S.; Fridlund, M.; Barragán, O. +47 more
We report on the discovery and validation of TOI 813 b (TIC 55525572 b), a transiting exoplanet identified by citizen scientists in data from NASA's Transiting Exoplanet Survey Satellite (TESS) and the first planet discovered by the Planet Hunters TESS project. The host star is a bright (V = 10.3 mag) subgiant (R\star - 1.94 R⊙