26 pages, 9 figures, submitted to Phys. Rev. D. Code available at this https URL
We present an $8.1\sigma$ detection of the non-Gaussian 4-Point Correlation Function (4PCF) using a sample of $N_{\rm g} \approx 8\times 10^5$ galaxies from the BOSS CMASS dataset. Our measurement uses the $\mathcal{O}(N_{\rm g}^2)$ NPCF estimator of Philcox et al. (2021), including a new modification to subtract the disconnected 4PCF contribution (arising from the product of two 2PCFs) at the estimator level. This approach is unlike previous work and ensures that our signal is a robust detection of gravitationally-induced non-Gaussianity. The estimator is validated with a suite of lognormal simulations, and the analytic form of the disconnected contribution is discussed. Due to the high dimensionality of the 4PCF, data compression is required; we use a signal-to-noise-based scheme calibrated from theoretical covariance matrices to restrict to $\sim$ $100$ basis vectors. The compression has minimal impact on the detection significance and facilitates traditional $\chi^2$-like analyses using a suite of mock catalogs. The significance is stable with respect to different treatments of noise in the sample covariance (arising from the limited number of mocks), but decreases to $4.7\sigma$ when a minimum galaxy separation of $14 h^{-1}\mathrm{Mpc}$ is enforced on the 4PCF tetrahedra (such that the statistic can be modelled more easily). The detectability of the 4PCF in the quasi-linear regime implies that it will become a useful tool in constraining cosmological and galaxy formation parameters from upcoming spectroscopic surveys.
The hot Jupiter WASP-12b has been found to be on a decaying 1.09-day orbit. The mean density of the planet inferred from transit and radial-velocity data is near its Roche limit; just how near depends on the planet's uncertain internal structure. There is also spectroscopic evidence of mass loss. We accurately calculate the Roche density on the assumption of a synchronously rotating $n=1$ polytrope, and find this to be only $15-20\%$ below the observational estimates for the mean density. We discuss the implied shape of the planet, its lifetime before complete disruption, and its current rate of mass loss based on our improved tidal model. The present mass-loss rate is at least as sensitive to the opacity and temperature profiles of the planet's atmosphere as to its internal structure, however.
Submitted as the opening paper of the Astrophysical Journal Focus Issue on Rubin LSST cadence and survey strategy
Vera C. Rubin Observatory is a ground-based astronomical facility under construction, a joint project of the National Science Foundation and the U.S. Department of Energy, designed to conduct a multi-purpose 10-year optical survey of the southern hemisphere sky: the Legacy Survey of Space and Time. Significant flexibility in survey strategy remains within the constraints imposed by the core science goals of probing dark energy and dark matter, cataloging the Solar System, exploring the transient optical sky, and mapping the Milky Way. The survey's massive data throughput will be transformational for many other astrophysics domains and Rubin's data access policy sets the stage for a huge potential users' community. To ensure that the survey science potential is maximized while serving as broad a community as possible, Rubin Observatory has involved the scientific community at large in the process of setting and refining the details of the observing strategy. The motivation, history, and decision-making process of this strategy optimization are detailed in this paper, giving context to the science-driven proposals and recommendations for the survey strategy included in this Focus Issue.
31 pages, 17 figures
We derive analytic covariance matrices for the $N$-Point Correlation Functions (NPCFs) of galaxies in the Gaussian limit. Our results are given for arbitrary $N$ and projected onto the isotropic basis functions of Cahn & Slepian (2020), recently shown to facilitate efficient NPCF estimation. A numerical implementation of the 4PCF covariance is compared to the sample covariance obtained from a set of lognormal simulations, Quijote dark matter halo catalogues, and MultiDark-Patchy galaxy mocks, with the latter including realistic survey geometry. The analytic formalism gives reasonable predictions for the covariances estimated from mock simulations with a periodic-box geometry. Furthermore, fitting for an effective volume and number density by maximizing a likelihood based on Kullback-Leibler divergence is shown to partially compensate for the effects of a non-uniform window function.
16 pages, 12 figures
20 pages, 10 figures, 3 tables, submitted to ApJ, comments are welcome
10 pages, 5 figures
27 pages, 17 figures, Submitted to ApJ
Presented at the 37th International Cosmic Ray Conference (ICRC 2021)
Accepted by A&A. Contains 54 pages, 21 figures, and appendices. Catalogs described in Tables B.1 and C.1 will be made available with published paper
Contribution to the 37th ICRC, Berlin 2021
17 pages, 3 figures, 1 appendix. Accepted by A&A
2 pages, 1 figure, Prepared for submission to Physical Review Letters (Comment)
21 pages, 10 figures, 5 tables. Accepted for publication in ApJ
50 pages, 41 figures. Submitted to AAS journals
14 pages, 9 figures, 1 table, submitted to The Astrophysical Journal
26 pages, 4 figures, 7 tables; to be submitted to JCAP
Accepted for publication in the Astrophysical Journal (ApJ)
9 pages, 6 figures
Proceeding of the 37th International Cosmic Ray Conference (ICRC2021)
11 pages, 6 figures, submitted to JKAS
Submitted to Proc. of the 37th International Cosmic Ray Conference (ICRC 2021), PoS-1144, July 12th -- 23rd, 2021, Online -- Berlin, Germany. 8 pages, 7 figures
10 pages, 7 figures, Accepted for publication in ApJL
6 pages, 3 figures
23 pages, 18 figures, accepted to MNRAS, see conference poster this https URL for short summary
10 pages, 9 figures, Proceedings of the 37th International Cosmic Ray Conference (ICRC 2021), Berlin, Germany
9 pages, 7 figures
10 pages, 11 figures, submitted to APJ
19 pages, 5 figures, accepted to MNRAS
18 pages, 12 figures; accepted for publication in Astronomy & Astrophysics
Accepted for publication in Astronomy & Astrophysics
8 pages, 5 figures, Proceedings of the 37th International Cosmic Ray Conference (ICRC2021)
Proceedings of the 37th International Cosmic Ray Conference (ICRC 2021). The online documentation is available at this https URL
13 pages, 9 figures. MNRAS accepted
Presented at the SMC-IT 2021 conference
Proceedings of the 37th International Cosmic Ray Conference (ICRC 2021)
8 pages, 4 figures; Proceedings of the 37th International Cosmic Ray Conference (ICRC2021). 12-23 July, 2021. Berlin, Germany. Online at this https URL
Accepted for publication in ApJ
11 pages, 5 figures, accepted by MNRAS
16 pages, 11 figures, 7 tables; accepted by Astronomy and Astrophysics
20 pages, 10 figures, accepted for publication in Astronomy and Astrophysics. Abstract abridged due to arXiv requirements
89 pages, 104 figures, submitted to The Astrophysical Journal (ApJ)
9 pages, 3 figures. Para uma FORMOSA aventura!
8 pages, 5 figures
49+1 pages, 17 figures, 2 tables
Presented at the 37th International Cosmic Ray Conference (ICRC 2021). See arXiv:2107.06966 for all IceCube contributions
4 pages, 4 figures; submitted for publication
93 pages, 22 figures
18 pages, 17 figures
33 pages, 31 figures, submitted to Physical Review Research
16 pages, 18 figures