Search Publications
Water Vapor in the Spectrum of the Extrasolar Planet HD 189733b. I. The Transit
Deming, D.; Crouzet, N.; Madhusudhan, N. +1 more
We report near-infrared spectroscopy of the gas giant planet HD 189733b in transit. We used the Hubble Space Telescope Wide Field Camera 3 (HST WFC3) with its G141 grism covering 1.1 µm to 1.7 µm and spatially scanned the image across the detector at 2'' s-1. When smoothed to 75 nm bins, the local maxima of the transit depth…
Thermal structure of an exoplanet atmosphere from phase-resolved emission spectroscopy
Madhusudhan, Nikku; Burrows, Adam; Fortney, Jonathan J. +13 more
Exoplanets that orbit close to their host stars are much more highly irradiated than their solar system counterparts. Understanding the thermal structures and appearances of these planets requires investigating how their atmospheres respond to such extreme stellar forcing. We present spectroscopic thermal emission measurements as a function of orb…
Hydrogen-poor Superluminous Supernovae and Long-duration Gamma-Ray Bursts Have Similar Host Galaxies
Price, P. A.; Berger, E.; Kirshner, R. P. +27 more
We present optical spectroscopy and optical/near-IR photometry of 31 host galaxies of hydrogen-poor superluminous supernovae (SLSNe), including 15 events from the Pan-STARRS1 Medium Deep Survey. Our sample spans the redshift range 0.1 <~ z <~ 1.6, and is the first comprehensive host galaxy study of this specific subclass of cosmic explosions…
The evolution of the dust and gas content in galaxies
Berta, S.; Magnelli, B.; Nordon, R. +36 more
We use deep Herschel observations taken with both PACS and SPIRE imaging cameras to estimate the dust mass of a sample of galaxies extracted from the GOODS-S, GOODS-N and the COSMOS fields. We divide the redshift-stellar mass (Mstar)-star formation rate (SFR) parameter space into small bins and investigate average properties over this g…
The incidence of obscuration in active galactic nuclei
Berta, S.; Magnelli, B.; Lutz, D. +22 more
We study the incidence of nuclear obscuration on a complete sample of 1310 active galactic nuclei (AGN) selected on the basis of their rest-frame 2-10 keV X-ray flux from the XMM-COSMOS survey, in the redshift range 0.3 < z < 3.5. We classify the AGN as obscured or unobscured on the basis of either the optical spectral properties and the ove…
Planck 2013 results. XXVII. Doppler boosting of the CMB: Eppur si muove
Bernard, J. -P.; Planck Collaboration; Aghanim, N. +181 more
Our velocity relative to the rest frame of the cosmic microwave background (CMB) generates a dipole temperature anisotropy on the sky which has been well measured for more than 30 years, and has an accepted amplitude of v/c = 1.23 × 10-3, or v = 369. In addition to this signal generated by Doppler boosting of the CMB monopole, our motio…
Localized sources of water vapour on the dwarf planet (1)Ceres
Marston, Anthony; Müller, Thomas; Lee, Seungwon +10 more
The `snowline' conventionally divides Solar System objects into dry bodies, ranging out to the main asteroid belt, and icy bodies beyond the belt. Models suggest that some of the icy bodies may have migrated into the asteroid belt. Recent observations indicate the presence of water ice on the surface of some asteroids, with sublimation a potential…
Evidence for Massive Neutrinos from Cosmic Microwave Background and Lensing Observations
Battye, Richard A.; Moss, Adam
We discuss whether massive neutrinos (either active or sterile) can reconcile some of the tensions within cosmological data that have been brought into focus by the recently released Planck data. We point out that a discrepancy is present when comparing the primary CMB and lensing measurements both from the CMB and galaxy lensing data using CFHTLe…
Observations of an extreme storm in interplanetary space caused by successive coronal mass ejections
Kajdič, Primož; Lavraud, Benoit; Nitta, Nariaki V. +8 more
Space weather refers to dynamic conditions on the Sun and in the space environment of the Earth, which are often driven by solar eruptions and their subsequent interplanetary disturbances. It has been unclear how an extreme space weather storm forms and how severe it can be. Here we report and investigate an extreme event with multi-point remote-s…
A Panchromatic View of the Restless SN 2009ip Reveals the Explosive Ejection of a Massive Star Envelope
Im, M.; Choi, C.; Campana, S. +54 more
The double explosion of SN 2009ip in 2012 raises questions about our understanding of the late stages of massive star evolution. Here we present a comprehensive study of SN 2009ip during its remarkable rebrightenings. High-cadence photometric and spectroscopic observations from the GeV to the radio band obtained from a variety of ground-based and …