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Observational constraints on successful model of quintessential Inflation
Starobinsky, Alexei A.; Geng, Chao-Qiang; Lee, Chung-Chi +2 more
We study quintessential inflation using a generalized exponential potential V(phi)propto \exp(-λ phin/MPln), n>1, the model admits slow-roll inflation at early times and leads to close-to-scaling behaviour in the post inflationary era with an exit to dark energy at late times. We present detailed investigations …
The Tip of the Red Giant Branch Distances to Typa Ia Supernova Host Galaxies. V. NGC 3021, NGC 3370, and NGC 1309 and the Value of the Hubble Constant
Lee, Myung Gyoon; Jang, In Sung
We present final results of a program for the determination of the Hubble constant based on the calibration of the Type Ia supernovae (SNe Ia) using the Tip of the Red Giant Branch (TRGB). We report TRGB distances to three SN Ia host galaxies, NGC 3021, NGC 3370, and NGC 1309. We obtain F555W and F814W photometry of resolved stars from the archiva…
Optical, UV, and X-ray evidence for a 7-yr stellar cycle in Proxima Centauri
Drake, J. J.; Saar, S. H.; Kashyap, V. L. +2 more
Stars of stellar type later than about M3.5 are believed to be fully convective and therefore unable to support magnetic dynamos like the one that produces the 11-yr solar cycle. Because of their intrinsic faintness, very few late M stars have undergone long-term monitoring to test this prediction, which is critical to our understanding of magneti…
Occurrence of Radio Minihalos in a Mass-limited Sample of Galaxy Clusters
Clarke, Tracy E.; Giacintucci, Simona; Venturi, Tiziana +3 more
We investigate the occurrence of radio minihalos—diffuse radio sources of unknown origin observed in the cores of some galaxy clusters—in a statistical sample of 58 clusters drawn from the Planck Sunyaev-Zel’dovich cluster catalog using a mass cut (M 500 > 6 × 1014 M ⊙). We supplement our statistical sample with…
ALMA [C II] 158 µm Detection of a Redshift 7 Lensed Galaxy behind RXJ1347.1-1145
Carilli, Chris; Fontana, Adriano; Treu, Tommaso +14 more
We present the results of ALMA spectroscopic follow-up of a z = 6.766 Lyα emitting galaxy behind the cluster RX J1347.1-1145. We report the detection of [C II] 158 µm line fully consistent with the Lyα redshift and with the peak of the optical emission. Given the magnification of µ = 5.0 ± 0.3, the intrinsic (corrected for lensing) lum…
A population of eruptive variable protostars in VVV
Minniti, D.; Lucas, P. W.; Thompson, M. A. +10 more
We present the discovery of 816 high-amplitude infrared variable stars (ΔKs > 1 mag) in 119 deg2 of the Galactic mid-plane covered by the VISTA Variables in the Via Lactea (VVV) survey. Almost all are new discoveries and about 50 per cent are young stellar objects (YSOs). This provides further evidence that YSOs are the co…
Effective temperatures of cataclysmic-variable white dwarfs as a probe of their evolution
Reichart, D. E.; Knigge, C.; Gänsicke, B. T. +29 more
We present HST spectroscopy for 45 cataclysmic variables (CVs), observed with HST/COS and HST/STIS. For 36 CVs, the white dwarf is recognisable through its broad Ly α absorption profile and we measure the white dwarf effective temperatures (Teff) by fitting the HST data assuming log g = 8.35, which corresponds to the average mass for CV…
Determining the Intrinsic CME Flux Rope Type Using Remote-sensing Solar Disk Observations
Palmerio, E.; Kilpua, E. K. J.; Green, L. M. +4 more
A key aim in space weather research is to be able to use remote-sensing observations of the solar atmosphere to extend the lead time of predicting the geoeffectiveness of a coronal mass ejection (CME). In order to achieve this, the magnetic structure of the CME as it leaves the Sun must be known. In this article we address this issue by developing…
Evidence for a Dayside Thermal Inversion and High Metallicity for the Hot Jupiter WASP-18b
Deming, Drake; Madhusudhan, Nikku; Gandhi, Siddharth +4 more
We find evidence for a strong thermal inversion in the dayside atmosphere of the highly irradiated hot Jupiter WASP-18b ({T}{eq}=2411 {{K}}, M=10.3 {M}J) based on emission spectroscopy from Hubble Space Telescope secondary eclipse observations and Spitzer eclipse photometry. We demonstrate a lack of water vapor in either abso…
Characterizing Intracluster Light in the Hubble Frontier Fields
Schmidt, Kasper B.; Treu, Tommaso; Vulcani, Benedetta +3 more
We investigate the intracluster light (ICL) in the six Hubble Frontier Field clusters at 0.3< z< 0.6. We employ a new method, which is free from any functional form of the ICL profile, and exploit the unprecedented depth of this Hubble Space Telescope imaging to map the ICL’s diffuse light out to clustrocentric radii R∼ 300 {kpc} ({µ }…