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BANYAN. IX. The Initial Mass Function and Planetary-mass Object Space Density of the TW HYA Association
Weinberger, Alycia J.; Donaldson, Jessica K.; Burgasser, Adam J. +15 more
A determination of the initial mass function (IMF) of the current, incomplete census of the 10 Myr-old TW Hya association (TWA) is presented. This census is built from a literature compilation supplemented with new spectra and 17 new radial velocities from ongoing membership surveys, as well as a reanalysis of Hipparcos data that confirmed HR 4334…
Beyond the Kepler/K2 bright limit: variability in the seven brightest members of the Pleiades
Aigrain, S.; Grundahl, F.; Albrecht, S. +20 more
The most powerful tests of stellar models come from the brightest stars in the sky, for which complementary techniques, such as astrometry, asteroseismology, spectroscopy and interferometry, can be combined. The K2 mission is providing a unique opportunity to obtain high-precision photometric time series for bright stars along the ecliptic. Howeve…
A Submillimeter Perspective on the GOODS Fields (SUPER GOODS). I. An Ultradeep SCUBA-2 Survey of the GOODS-N
Wang, W. -H.; Owen, F. N.; Barger, A. J. +3 more
In this first paper in the SUPER GOODS series on powerfully star-forming galaxies in the two GOODS fields, we present a deep SCUBA-2 survey of the GOODS-N at both 850 and 450 µm (central rms noise of 0.28 mJy and 2.6 mJy, respectively). In the central region, the 850 µm observations cover the GOODS-N to near the confusion limit of ∼1.6…
The population of hot subdwarf stars studied with Gaia. I. The catalog of known hot subdwarf stars
Geier, S.; Gänsicke, B. T.; Green, E. M. +5 more
In preparation for the upcoming all-sky data releases of the Gaia mission we compiled a catalog of known hot subdwarf stars and candidates drawn from the literature and yet unpublished databases. The catalog contains 5613 unique sources and provides multi-band photometry from the ultraviolet to the far infrared, ground based proper motions, classi…
Multiple stellar populations in Magellanic Cloud clusters - V. The split main sequence of the young cluster NGC 1866
Anderson, J.; Milone, A. P.; Marino, A. F. +7 more
One of the most unexpected results in the field of stellar populations of the last few years is the discovery that some Magellanic Cloud globular clusters younger than ∼400 Myr exhibit bimodal main sequences (MSs) in their colour-magnitude diagrams (CMDs). Moreover, these young clusters host an extended main-sequence turn-off (eMSTO) in close anal…
Coherent Structures at Ion Scales in Fast Solar Wind: Cluster Observations
Maksimovic, M.; Alexandrova, O.; Lion, S. +5 more
We investigate the nature of magnetic turbulent fluctuations, around ion characteristic scales, in a fast solar wind stream, by using Cluster data. Contrarily to slow solar wind, where both Alfvénic (δ {b}\perp \gg δ {b}\parallel ) and compressive (δ {b}\parallel \gg δ {b}\perp ) coherent structures are …
NGC 1866: First Spectroscopic Detection of Fast-rotating Stars in a Young LMC Cluster
Mateo, M.; Crane, J. D.; Milone, A. P. +6 more
High-resolution spectroscopic observations were taken of 29 extended main-sequence turnoff (eMSTO) stars in the young (∼200 Myr) Large Magellanic Cloud (LMC) cluster, NGC 1866, using the Michigan/Magellan Fiber System and MSpec spectrograph on the Magellan-Clay 6.5 m telescope. These spectra reveal the first direct detection of rapidly rotating st…
On the Early-time Excess Emission in Hydrogen-poor Superluminous Supernovae
Filippenko, Alexei V.; Cenko, S. Bradley; Sollerman, Jesper +27 more
We present the light curves of the hydrogen-poor superluminous supernovae (SLSNe I) PTF 12dam and iPTF 13dcc, discovered by the (intermediate) Palomar Transient Factory. Both show excess emission at early times and a slowly declining light curve at late times. The early bump in PTF 12dam is very similar in duration (∼10 days) and brightness relati…
Estimation of Reconnection Flux Using Post-eruption Arcades and Its Relevance to Magnetic Clouds at 1 AU
Gopalswamy, N.; Yashiro, S.; Xie, H. +1 more
We report on a new method to compute the flare reconnection (RC) flux from post-eruption arcades (PEAs) and the underlying photospheric magnetic fields. In previous works, the RC flux has been computed using the cumulative flare ribbon area. Here we obtain the RC flux as the flux in half of the area underlying the PEA in EUV imaged after the flare…
Axion-like particles and recent observations of the cosmic infrared background radiation
Kohri, Kazunori; Kodama, Hideo
The CIBER collaboration released their first observational data of the Cosmic IR background (CIB) radiation, which has significant excesses at around the wavelength ∼1 µ m compared to theoretically-inferred values. The amount of the CIB radiation has a significant influence on the opaqueness of the Universe for TeV gamma-rays emitted from di…