Search Publications
Reconstruction of solar spectral irradiance since the Maunder minimum
Solanki, S. K.; Krivova, N. A.; Vieira, L. E. A.
Solar irradiance is the main external driver of the Earth's climate. Whereas the total solar irradiance is the main source of energy input into the climate system, solar UV irradiance exerts control over chemical and physical processes in the Earth's upper atmosphere. The time series of accurate irradiance measurements are, however, relatively sho…
Strengthening the Case for Asteroidal Accretion: Evidence for Subtle and Diverse Disks at White Dwarfs
Zuckerman, B.; Jura, M.; Farihi, J. +1 more
Spitzer Space Telescope IRAC 3-8 µm and AKARI IRC 2-4 µm photometry are reported for 10 white dwarfs with photospheric heavy elements; nine relatively cool stars with photospheric calcium and one hotter star with a peculiar high carbon abundance. A substantial infrared excess is detected at HE 2221-1630, while modest excess emissions a…
Spectroscopic confirmation of a galaxy at redshift z = 8.6
Swinbank, A. M.; Bremer, M. N.; Evans, C. J. +6 more
Galaxies had their most significant impact on the Universe when they assembled their first generations of stars. Energetic photons emitted by young, massive stars in primeval galaxies ionized the intergalactic medium surrounding their host galaxies, cleared sightlines along which the light of the young galaxies could escape, and fundamentally alte…
HerMES: deep galaxy number counts from a P(D) fluctuation analysis of SPIRE Science Demonstration Phase observations
Altieri, B.; Aussel, H.; Elbaz, D. +71 more
Dusty, star-forming galaxies contribute to a bright, currently unresolved cosmic far-infrared background. Deep Herschel-Spectral and Photometric Imaging Receiver (SPIRE) images designed to detect and characterize the galaxies that comprise this background are highly confused, such that the bulk lies below the classical confusion limit. We analyse …
Super star clusters in Haro 11: properties of a very young starburst and evidence for a near-infrared flux excess
Östlin, G.; Hayes, M.; Adamo, A. +3 more
We have used multiband imaging to investigate the nature of an extreme starburst environment in the nearby Lyman break galaxy analogue Haro 11 (ESO350-IG038) by means of its stellar cluster population. The central starburst region has been observed in eight different high-resolution Hubble Space Telescope (HST) wavebands, sampling the stellar and …
Masses and luminosities of O- and B-type stars and red supergiants
Neuhäuser, R.; Hohle, M. M.; Schutz, B. F.
Massive stars are of interest as progenitors of supernovae, i.e. neutron stars and black holes, which can be sources of gravitational waves. Recent population synthesis models can predict neutron star and gravitational wave observations but deal with a fixed supernova rate or an assumed initial mass function for the population of massive stars. He…
On the Existence of Energetic Atoms in the Upper Atmosphere of Exoplanet HD209458b
Ben-Jaffel, Lotfi; Sona Hosseini, S.
Stellar irradiation and particle forcing strongly affect the immediate environment of extrasolar giant planets orbiting near their parent stars. However, it is not clear how the energy is deposited over the planetary atmosphere, nor how the momentum and energy spaces of the different species that populate the system are modified. Here, we use far-…
Confirmation of the Compactness of a z = 1.91 Quiescent Galaxy with Hubble Space Telescope's Wide Field Camera 3
van Dokkum, Pieter G.; Franx, Marijn; Illingworth, Garth D. +6 more
We present very deep Wide Field Camera 3 (WFC3) photometry of a massive, compact galaxy located in the Hubble Ultra Deep Field. This quiescent galaxy has a spectroscopic redshift z = 1.91 and has been identified as an extremely compact galaxy by Daddi et al. We use new H F160W imaging data obtained with Hubble Space Telescope/WFC3 to me…
Conjugate ground and multisatellite observations of compression-related EMIC Pc1 waves and associated proton precipitation
Glassmeier, K. -H.; Matsui, H.; Fornacon, K. -H. +10 more
We present coordinated ground satellite observations of solar wind compression-related dayside electromagnetic ion cyclotron (EMIC) waves from 25 September 2005. On the ground, dayside structured EMIC wave activity was observed by the CARISMA and STEP magnetometer arrays for several hours during the period of maximum compression. The EMIC waves we…
Detection of the ellipsoidal and the relativistic beaming effects in the CoRoT-3 lightcurve
Mazeh, T.; Faigler, S.
CoRoT-3b is a 22 Jupiter-mass massive-planet/brown-dwarf object, orbiting an F3-star with a period of 4.3 days. We analyzed the out-of-transit CoRoT-3 red-channel lightcurve obtained by the CoRoT mission and detected the ellipsoidal modulation, with half the orbital period and an amplitude of 59 ± 9 ppm (parts per million), and the relativistic be…