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Sequence and relative timing of large lakes in Gale crater (Mars) after the formation of Mount Sharp
Mangold, Nicolas; Williams, Rebecca M. E.; Palucis, Marisa C. +6 more
The quantification of lake levels in Gale crater is important to define the hydrologic and climatic history experienced by the sedimentary deposits found by Curiosity. We propose that there were at least three major lake stands within Gale, each persisted >1000 years, and all occurred after Mount Sharp reached close to its current topographic f…
Gaia Data Release 1. The Cepheid and RR Lyrae star pipeline and its application to the south ecliptic pole region
Szabados, L.; Rimoldini, L.; Holl, B. +24 more
Context. The European Space Agency spacecraft Gaia is expected to observe about 10 000 Galactic Cepheids and over 100 000 Milky Way RR Lyrae stars (a large fraction of which will be new discoveries), during the five-year nominal lifetime spent scanning the whole sky to a faint limit of G = 20.7 mag, sampling their light variation on average about …
The First Circumbinary Planet Found by Microlensing: OGLE-2007-BLG-349L(AB)c
Bennett, D. P.; Gal-Yam, A.; Ofek, E. +84 more
We present the analysis of the first circumbinary planet microlensing event, OGLE-2007-BLG-349. This event has a strong planetary signal that is best fit with a mass ratio of q ≈ 3.4 × 10-4, but there is an additional signal due to an additional lens mass, either another planet or another star. We find acceptable light-curve fits with t…
Modelling supernova line profile asymmetries to determine ejecta dust masses: SN 1987A from days 714 to 3604
Barlow, M. J.; Bevan, Antonia
The late-time optical and near-IR line profiles of many core-collapse supernovae exhibit a red-blue asymmetry as a result of greater extinction by internal dust of radiation emitted from the receding parts of the supernova ejecta. We present here a new code, DAMOCLES, that models the effects of dust on the line profiles of core-collapse supernovae…
Dead or Alive? Long-term evolution of SN 2015bh (SNhunt275)
Brown, P. J.; Smartt, S. J.; Kotak, R. +37 more
Supernova (SN) 2015bh (or SNhunt275) was discovered in NGC 2770 on 2015 February with an absolute magnitude of Mr ∼ -13.4 mag, and was initially classified as an SN impostor. Here, we present the photometric and spectroscopic evolution of SN 2015bh from discovery to late phases (∼1 yr after). In addition, we inspect archival images of t…
HeCS-SZ: The Hectospec Survey of Sunyaev-Zeldovich-selected Clusters
Diaferio, Antonaldo; Hwang, Ho Seong; Geller, Margaret J. +1 more
We estimate cluster masses and velocity dispersions for 123 clusters from optical spectroscopy to compare the Sunyaev-Zeldovich (SZ) mass proxy and dynamical masses. Our new survey, HeCS-SZ (Hectospec Cluster Survey of SZ-selected clusters), includes 7721 new or remeasured redshifts from MMT/Hectospec observations of 21 SZ-selected clusters at red…
A self-consistent model for the evolution of the gas produced in the debris disc of β Pictoris
Pringle, J. E.; Kral, Q.; Juhász, A. +3 more
This paper presents a self-consistent model for the evolution of gas produced in the debris disc of β Pictoris. Our model proposes that atomic carbon and oxygen are created from the photodissociation of CO, which is itself released from volatile-rich bodies in the debris disc due to grain-grain collisions or photodesorption. While the CO lasts les…
High angular resolution Sunyaev-Zel'dovich observations of MACS J1423.8+2404 with NIKA: Multiwavelength analysis
Adam, R.; Arnaud, M.; Benoît, A. +42 more
The prototype of the NIKA2 camera, NIKA, is a dual-band instrument operating at the IRAM 30-m telescope, which can observe the sky simultaneously at 150 and 260 GHz. One of the main goals of NIKA (and NIKA2) is to measure the pressure distribution in galaxy clusters at high angular resolution using the thermal Sunyaev-Zel'dovich (tSZ) effect. Such…
The 31 Deg2 Release of the Stripe 82 X-Ray Survey: The Point Source Catalog
Schawinski, Kevin; Comastri, Andrea; Komossa, S. +23 more
We release the next installment of the Stripe 82 X-ray survey point-source catalog, which currently covers 31.3 deg2 of the Sloan Digital Sky Survey (SDSS) Stripe 82 Legacy field. In total, 6181 unique X-ray sources are significantly detected with XMM-Newton (>5σ) and Chandra (>4.5σ). This catalog release includes data from XMM-Ne…
The Diverse Origins of Neutron-capture Elements in the Metal-poor Star HD 94028: Possible Detection of Products of I-Process Nucleosynthesis
Roederer, Ian U.; Karakas, Amanda I.; Pignatari, Marco +1 more
We present a detailed analysis of the composition and nucleosynthetic origins of the heavy elements in the metal-poor ([Fe/H] = -1.62 ± 0.09) star HD 94028. Previous studies revealed that this star is mildly enhanced in elements produced by the slow neutron-capture process (s process; e.g., [Pb/Fe] = +0.79 ± 0.32) and rapid neutron-capture process…