Discovery and analysis of p-mode and g-mode oscillations in the A-type primary of the eccentric binary HD 209295

We have discovered both intermediate-order gravity mode and low-order pressure mode pulsation in the same star, HD 209295. It is therefore both a Gamma Doradus and a Delta Scuti star, which makes it the first pulsating star to be a member of two classes. The star is a single-lined spectroscopic binary with an orbital period of 3.10575 d and an eccentricity of 0.352. Weak pulsational signals are found in both the radial velocity and line-profile variations, allowing us to show that the two highest-amplitude Gamma Doradus pulsation modes are consistent with l=1 and |m|=1. In our 280 h of BVI multi-site photometry we detected ten frequencies in the light variations, one in the Delta Scuti regime and nine in the Gamma Doradus domain. Five of the Gamma Doradus frequencies are exact integer multiples of the orbital frequency. This observation leads us to suspect they are tidally excited. Results of theoretical modeling (stability analysis, tidal excitation) were consistent with the observations. We could not detect the secondary component of the system in infrared photometry, suggesting that it may not be a main-sequence star. Archival data of HD 209295 show a strong ultraviolet excess, the origin of which is not known. The orbit of the primary is consistent with a secondary mass of M > 1.04 Msun indicative of a neutron star or a white dwarf companion.Comment: 18 pages, 18 figures, accepted for publication in MNRAS, shortened abstrac

Gravitational Waves from Gravitational Collapse

Gravitational wave emission from the gravitational collapse of massive stars has been studied for more than three decades. Current state of the art numerical investigations of collapse include those that use progenitors with realistic angular momentum profiles, properly treat microphysics issues, account for general relativity, and examine non--axisymmetric effects in three dimensions. Such simulations predict that gravitational waves from various phenomena associated with gravitational collapse could be detectable with advanced ground--based and future space--based interferometric observatories.Comment: 68 pages including 13 figures; revised version accepted for publication in Living Reviews in Relativity (http://www.livingreviews.org

Retrospective evaluation of whole exome and genome mutation calls in 746 cancer samples

Funder: NCI U24CA211006Abstract: The Cancer Genome Atlas (TCGA) and International Cancer Genome Consortium (ICGC) curated consensus somatic mutation calls using whole exome sequencing (WES) and whole genome sequencing (WGS), respectively. Here, as part of the ICGC/TCGA Pan-Cancer Analysis of Whole Genomes (PCAWG) Consortium, which aggregated whole genome sequencing data from 2,658 cancers across 38 tumour types, we compare WES and WGS side-by-side from 746 TCGA samples, finding that ~80% of mutations overlap in covered exonic regions. We estimate that low variant allele fraction (VAF < 15%) and clonal heterogeneity contribute up to 68% of private WGS mutations and 71% of private WES mutations. We observe that ~30% of private WGS mutations trace to mutations identified by a single variant caller in WES consensus efforts. WGS captures both ~50% more variation in exonic regions and un-observed mutations in loci with variable GC-content. Together, our analysis highlights technological divergences between two reproducible somatic variant detection efforts

Vue d’artiste montrant un nuage géant d’hydrogène s’écoulant d’une planète chaude de la taille de Neptune, à 97 années-lumière de la Terre. L’exoplanète est minuscule comparée à son étoile, une naine rouge nommé GJ 3470. Le rayonnement intense de l’étoile chauffe l’hydrogène dans la haute atmosphère de la planète à tel point qu’il s’échappe dans l’espace. GJ 3470 perd de l’hydrogène à un rythme 100 fois plus élevé qu’une Neptune chaude précédemment observée et dont l’atmosphère s’évapore également.<p>--------</p>This artist’s illustration shows a giant cloud of hydrogen streaming off a warm, Neptune-sized planet just 97 light-years from Earth. The exoplanet is tiny compared to its star, a red dwarf named GJ 3470. The star’s intense radiation is heating the hydrogen in the planet’s upper atmosphere to a point where it escapes into space. The alien world is losing hydrogen at a rate 100 times faster than a previously observed warm Neptune whose atmosphere is also evaporating away.

Vue d’artiste montrant un nuage géant d’hydrogène s’écoulant d’une planète chaude de la taille de Neptune, à 97 années-lumière de la Terre. L’exoplanète est minuscule comparée à son étoile, une naine rouge nommé GJ 3470. Le rayonnement intense de l’étoile chauffe l’hydrogène dans la haute atmosphère de la planète à tel point qu’il s’échappe dans l’espace. GJ 3470 perd de l’hydrogène à un rythme 100 fois plus élevé qu’une Neptune chaude précédemment observée et dont l’atmosphère s’évapore également.--------This artist’s illustration shows a giant cloud of hydrogen streaming off a warm, Neptune-sized planet just 97 light-years from Earth. The exoplanet is tiny compared to its star, a red dwarf named GJ 3470. The star’s intense radiation is heating the hydrogen in the planet’s upper atmosphere to a point where it escapes into space. The alien world is losing hydrogen at a rate 100 times faster than a previously observed warm Neptune whose atmosphere is also evaporating away

Ce graphique situe les exoplanètes en fonction de leur taille et de leur distance par rapport à leur étoile. Chaque point représente une exoplanète. Des planètes de la taille de Jupiter (situées en haut du graphique) et des planètes de la taille de la Terre et des super-Terres (en bas) se trouvent à la fois proches et loin de leur étoile. Mais les planètes de la taille de Neptune (au milieu), proches de leur étoile, sont rares. Ce soi-disant désert de Neptune chaude montre que de tels mondes extraterrestres sont rares, ou qu'ils étaient abondants à une certaine époque, mais ont disparu depuis. L’observation que GJ3470b, une Neptune chaude à la limite du désert, est en train de perdre rapidement son atmosphère suggère que les Neptunes plus chaudes ont pu se transformer en super-Terre plus petites et rocheuses.<p>--------</p>This graphic plots exoplanets based on their size and distance from their star. Each dot represents an exoplanet. Planets the size of Jupiter (located at the top of the graphic) and planets the size of Earth and so-called super-Earths (at the bottom) are found both close and far from their star. But planets the size of Neptune (in the middle of the plot) are scarce close to their star. This so-called desert of hot Neptunes shows that such alien worlds are rare, or, they were plentiful at one time, but have since disappeared. The detection that GJ3470b, a warm Neptune at the border of the desert, is fast losing its atmosphere suggests that hotter Neptunes may have eroded down to smaller, rocky super-Earths.

Ce graphique situe les exoplanètes en fonction de leur taille et de leur distance par rapport à leur étoile. Chaque point représente une exoplanète. Des planètes de la taille de Jupiter (situées en haut du graphique) et des planètes de la taille de la Terre et des super-Terres (en bas) se trouvent à la fois proches et loin de leur étoile. Mais les planètes de la taille de Neptune (au milieu), proches de leur étoile, sont rares. Ce soi-disant désert de Neptune chaude montre que de tels mondes extraterrestres sont rares, ou qu'ils étaient abondants à une certaine époque, mais ont disparu depuis. L’observation que GJ3470b, une Neptune chaude à la limite du désert, est en train de perdre rapidement son atmosphère suggère que les Neptunes plus chaudes ont pu se transformer en super-Terre plus petites et rocheuses.--------This graphic plots exoplanets based on their size and distance from their star. Each dot represents an exoplanet. Planets the size of Jupiter (located at the top of the graphic) and planets the size of Earth and so-called super-Earths (at the bottom) are found both close and far from their star. But planets the size of Neptune (in the middle of the plot) are scarce close to their star. This so-called desert of hot Neptunes shows that such alien worlds are rare, or, they were plentiful at one time, but have since disappeared. The detection that GJ3470b, a warm Neptune at the border of the desert, is fast losing its atmosphere suggests that hotter Neptunes may have eroded down to smaller, rocky super-Earths

INVISIBILIZADO EL CAMPO ELECTROMAGNÉTICO DE UNA GALAXIA

La galaxia NGC 4217

The Ring Nebula, NGC 6720

THE NORTH DAKOTA SPACE GRANT CONSORTIUM COLLECTION NASA initiated the National Space Grant College and Fellowship Program, also known as Space Grant, in 1989. This national network of colleges and universities works to expand opportunities for Americans to understand and participate in NASA\u27s aeronautics and space projects by supporting and enhancing science and engineering education, research, and public engagement efforts. The  North Dakota NASA Space Grant Consortium (NDSGC)  was established in February of 1991. The North Dakota NASA Space Grant Consortium fulfills the Space Grant mission by involving North Dakota faculty, students, and K‐12 teachers and students in multi‐institutional, collaborative, NASA‐relevant research and education projects, while also educating the North Dakota citizenry about NASA, its purpose, and its missions. The North Dakota Space Grant Consortium has a collection of printed posters, photos, and art available to the public. Pieces can be collected at the North Dakota Space Grant Consortium office (Clifford Hall, Room 270) on the UND campus. Image text: National Aeronautics and Space Administration NASA The Ring Nebula, NGC 6720https://commons.und.edu/ndsgc-posters/1040/thumbnail.jp

Interacting Galaxies Arp 273

THE NORTH DAKOTA SPACE GRANT CONSORTIUM COLLECTION NASA initiated the National Space Grant College and Fellowship Program, also known as Space Grant, in 1989. This national network of colleges and universities works to expand opportunities for Americans to understand and participate in NASA\u27s aeronautics and space projects by supporting and enhancing science and engineering education, research, and public engagement efforts. The  North Dakota NASA Space Grant Consortium (NDSGC)  was established in February of 1991. The North Dakota NASA Space Grant Consortium fulfills the Space Grant mission by involving North Dakota faculty, students, and K‐12 teachers and students in multi‐institutional, collaborative, NASA‐relevant research and education projects, while also educating the North Dakota citizenry about NASA, its purpose, and its missions. The North Dakota Space Grant Consortium has a collection of printed posters, photos, and art available to the public. Pieces can be collected at the North Dakota Space Grant Consortium office (Clifford Hall, Room 270) on the UND campus. Image text: Interacting Galaxies Arp 273 National Aeronautics and Space Administration NASAhttps://commons.und.edu/ndsgc-posters/1023/thumbnail.jp