Hydroxyl (OH) Seen for the First Time in an Exoplanet Atmosphere The molecule hydroxyl (HO) is common on Earth, but astronomers have not yet determined how abundant it is on other worlds. For the first time, astronomers have conclusively detected it in the atmosphere of an ultra-hot Jupiter, WASP-33b. WASP-33b is a strange exoplanet. 400 […]
Astronomers Measure the Background Brightness of the Night sky Across the World. Canary Islands are the Darkest in the Survey Being able to look up at a clear, dark sky is becoming more and more rare in the rich world. Authors, artists, and even scientists have started to express concern about what our lack of […]
Massive Stars Mix Hydrogen in Their Cores, Causing Them to Pulse Every few Hours or Days Main sequence stars fuse hydrogen in their cores. It’s how they produce the energy they need to shine and keeps them from collapsing under their own weight. As hydrogen is fused into helium, there is less hydrogen available in […]
Surrogate modelling the Baryonic Universe II: on forward modelling the colours of individual and populations of galaxies. (arXiv:2105.05853v1 [astro-ph.GA]) <a href="http://arxiv.org/find/astro-ph/1/au:+Chaves_Montero_J/0/1/0/all/0/1">Jonas Chaves-Montero</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Hearin_A/0/1/0/all/0/1">Andrew Hearin</a> Among the properties shaping the light of a galaxy, the star formation history (SFH) is one of the most challenging to model due to the variety of correlated physical processes […]
Testing the nature of dark compact objects with gravitational waves. (arXiv:2105.06410v1 [gr-qc]) <a href="http://arxiv.org/find/gr-qc/1/au:+Maggio_E/0/1/0/all/0/1">Elisa Maggio</a>, <a href="http://arxiv.org/find/gr-qc/1/au:+Pani_P/0/1/0/all/0/1">Paolo Pani</a>, <a href="http://arxiv.org/find/gr-qc/1/au:+Raposo_G/0/1/0/all/0/1">Guilherme Raposo</a> Within Einstein’s theory of gravity, any compact object heavier than a few solar masses must be a black hole. Any observation showing otherwise would imply either new physics beyond General Relativity or new exotic […]
Periodic structure in the FRB 121102 spectra. (arXiv:2010.15145v2 [astro-ph.HE] UPDATED) <a href="http://arxiv.org/find/astro-ph/1/au:+Levkov_D/0/1/0/all/0/1">D.G. Levkov</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Panin_A/0/1/0/all/0/1">A.G. Panin</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Tkachev_I/0/1/0/all/0/1">I.I. Tkachev</a> Reiterating publically available data, we discover a remarkable periodic structure in the spectra of repeating Fast Radio Burst (FRB) 121102: a set of $(95pm 16)$ MHz-equidistant peaks with seemingly frequency-independent interpeak distance. These peaks can be […]
Pulsar Candidate Identification Using Semi-Supervised Generative Adversarial Networks. (arXiv:2010.07457v2 [astro-ph.IM] UPDATED) <a href="http://arxiv.org/find/astro-ph/1/au:+Balakrishnan_V/0/1/0/all/0/1">Vishnu Balakrishnan</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Champion_D/0/1/0/all/0/1">David Champion</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Barr_E/0/1/0/all/0/1">Ewan Barr</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Kramer_M/0/1/0/all/0/1">Michael Kramer</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Sengar_R/0/1/0/all/0/1">Rahul Sengar</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Bailes_M/0/1/0/all/0/1">Matthew Bailes</a> Machine learning methods are increasingly helping astronomers identify new radio pulsars. However, they require a large amount of labelled data, which is time consuming to produce […]
Detecting the relativistic bispectrum in 21cm intensity maps. (arXiv:2009.06197v2 [astro-ph.CO] UPDATED) <a href="http://arxiv.org/find/astro-ph/1/au:+Jolicoeur_S/0/1/0/all/0/1">Sheean Jolicoeur</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Maartens_R/0/1/0/all/0/1">Roy Maartens</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Weerd_E/0/1/0/all/0/1">Eline M. De Weerd</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Umeh_O/0/1/0/all/0/1">Obinna Umeh</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Clarkson_C/0/1/0/all/0/1">Chris Clarkson</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Camera_S/0/1/0/all/0/1">Stefano Camera</a> We investigate the detectability of leading-order relativistic effects in the bispectrum of future 21cm intensity mapping surveys. The relativistic signal arises from Doppler and […]
Main Sequence Scatter is Real: The Joint Dependence of Galaxy Clustering on Star Formation and Stellar Mass. (arXiv:2009.02405v2 [astro-ph.GA] UPDATED) <a href="http://arxiv.org/find/astro-ph/1/au:+Berti_A/0/1/0/all/0/1">Angela M. Berti</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Coil_A/0/1/0/all/0/1">Alison L. Coil</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Hearin_A/0/1/0/all/0/1">Andrew P. Hearin</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Behroozi_P/0/1/0/all/0/1">Peter S. Behroozi</a> We present new measurements of the clustering of stellar mass-complete samples of $sim40,000$ SDSS galaxies at $zsim0.03$ as a […]
Modeling of two CoRoT solar analogues constrained by seismic and spectroscopic analysis. (arXiv:2008.01163v2 [astro-ph.SR] UPDATED) <a href="http://arxiv.org/find/astro-ph/1/au:+Castro_M/0/1/0/all/0/1">M. Castro</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Baudin_F/0/1/0/all/0/1">F. Baudin</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Benomar_O/0/1/0/all/0/1">O. Benomar</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Samadi_R/0/1/0/all/0/1">R. Samadi</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Morel_T/0/1/0/all/0/1">T. Morel</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Barban_C/0/1/0/all/0/1">C. Barban</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Nascimento_J/0/1/0/all/0/1">J. D. do Nascimento Jr.</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Lebreton_Y/0/1/0/all/0/1">Y. Lebreton</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Boumier_P/0/1/0/all/0/1">P. Boumier</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Marques_J/0/1/0/all/0/1">J. P. Marques</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Costa_J/0/1/0/all/0/1">J. S. da Costa</a> Solar […]
Super-Earths and sub-Neptunes are Insensitive to Stellar Metallicity. (arXiv:2003.08431v3 [astro-ph.EP] UPDATED) <a href="http://arxiv.org/find/astro-ph/1/au:+Kutra_T/0/1/0/all/0/1">Taylor Kutra</a> (University of Toronto), <a href="http://arxiv.org/find/astro-ph/1/au:+Wu_Y/0/1/0/all/0/1">Yanqin Wu</a> (University of Toronto), <a href="http://arxiv.org/find/astro-ph/1/au:+Qian_Y/0/1/0/all/0/1">Yansong Qian</a> (University of Toronto) Kepler planets (including super-Earths and sub-Neptunes, from 1 to 4 Earth radii) are likely formed before the gaseous proto-planetary disks have dissipated, as are the Jovian […]
Linking the brightest stellar streams with the accretion history of Milky Way-like galaxies. (arXiv:2105.06467v1 [astro-ph.GA]) <a href="http://arxiv.org/find/astro-ph/1/au:+Vera_Casanova_A/0/1/0/all/0/1">Alex Vera-Casanova</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Gomez_F/0/1/0/all/0/1">Facundo A. Gómez</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Monachesi_A/0/1/0/all/0/1">Antonela Monachesi</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Gargiulo_I/0/1/0/all/0/1">Ignacio Gargiulo</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Pallero_D/0/1/0/all/0/1">Diego Pallero</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Grand_R/0/1/0/all/0/1">Robert J. J. Grand</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Marinacci_F/0/1/0/all/0/1">Federico Marinacci</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Pakmor_R/0/1/0/all/0/1">Rüdiger Pakmor</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Simpson_C/0/1/0/all/0/1">Christine M. Simpson</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Frenk_C/0/1/0/all/0/1">Carlos S. Frenk</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Morales_G/0/1/0/all/0/1">Gustavo Morales</a> According to […]
Binary neutron star merger in common envelope jet supernovae. (arXiv:2105.06452v1 [astro-ph.HE]) <a href="http://arxiv.org/find/astro-ph/1/au:+Soker_N/0/1/0/all/0/1">Noam Soker</a> (Technion, Israel) I explore a triple-star scenario where a tight neutron star (NS) – NS binary system enters the envelope of a red supergiant (RSG) star and spirals-in towards its core. The two NSs accrete mass through accretion disks and launch […]
A study of an energy-dependent anisotropy of cosmic rays beyond the GZK cut-off with deep neural networks. (arXiv:2105.06414v1 [astro-ph.HE]) <a href="http://arxiv.org/find/astro-ph/1/au:+Kalashev_O/0/1/0/all/0/1">Oleg Kalashev</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Pshirkov_M/0/1/0/all/0/1">Maxim Pshirkov</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Zotov_M/0/1/0/all/0/1">Mikhail Zotov</a> In this letter, we present an update of a method for analysing arrival directions of ultra-high-energy cosmic rays (UHECRs) above the Greisen–Zatsepin–Kuz’min cut-off with a deep convolutional […]
Temporal changes of near-surface air temperature in Poland for 1781-2016 and in Tbilisi (Georgia) for 1881-2016. (arXiv:2105.06389v1 [physics.ao-ph]) <a href="http://arxiv.org/find/physics/1/au:+Modzelewska_R/0/1/0/all/0/1">R. Modzelewska</a>, <a href="http://arxiv.org/find/physics/1/au:+Alania_M/0/1/0/all/0/1">M. V. Alania</a>, <a href="http://arxiv.org/find/physics/1/au:+Kapanadze_N/0/1/0/all/0/1">N. I. Kapanadze</a>, <a href="http://arxiv.org/find/physics/1/au:+Khelaia_E/0/1/0/all/0/1">E. I. Khelaia</a> Analyses of near-surface air temperature T in Poland for 1781-2016 and in Tbilisi (Georgia) for 1881-2016 have been carried out. We show […]
Detectable Data-driven Features in the Primordial Scalar Power Spectrum. (arXiv:2011.14774v2 [astro-ph.CO] UPDATED) <a href="http://arxiv.org/find/astro-ph/1/au:+Esmaeilian_M/0/1/0/all/0/1">Muhammad Sadegh Esmaeilian</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Farhang_M/0/1/0/all/0/1">Marzieh Farhang</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Khodabakhshi_S/0/1/0/all/0/1">Shirin Khodabakhshi</a> In this work we explore the power of future large-scale surveys to constrain possible deviations from the standard single-field slow-roll inflationary scenario. Specifically, we parametrize possible fluctuations around the almost scale-invariant primordial scalar […]
#107 – May 2021 Part 2 The Discussion: Farewell to Michael Collins Jeni back on the radio, other podcasts and TV – cc/crhxtz Listeners’ emails The News: Blue Origin prepares to take space tourists The launch of China’s new Space Station & falling space debris Can you help the Royal Astronomical Society find the […]
Older Stars Rotate Faster Than Expected Older stars should slow down, but new observations reveal that they have just as much of a spring in their step as their younger cousins. Astronomers suspect that complex interactions with the star’s magnetic field might be to blame. All stars spin. And all stars have magnetic fields. As […]
Concerns About James Webb’s Ariane 5 Rocket Might Push the Launch Back A new report from the US Government Accountability Office (GAO) says that the launch of the long-awaited, highly anticipated James Webb Space Telescope (JWST) will very likely be delayed due to an anomaly identified in the Ariane 5 launch vehicle. Launch for JWST […]
Charting the expansion history of the universe with supernovae An international research team analyzed a database of more than 1000 supernova explosions and found that models for the expansion of the Universe best match the data when a new time dependent variation is introduced. If proven correct with future, higher-quality data from the Subaru Telescope […]
