Digital Commons Network^™

Relationship Between Atmospheric Teleconnections And The Northern Hemisphere's Circumpolar Vortex, N Bushra, R V. Rohli

Faculty Publications

The Northern Hemispheric circumpolar vortex (NHCPV) is the hemispheric-scale, middle- and upper-tropospheric wind belt circumnavigating the North Pole. It is delineated by the well-known polar front jet stream, and it bends poleward at ridges and equatorward at troughs at various amplitudes and positions over time. Previous work assessed the accuracy of representing the NHCPV using a new technique through correlations to air-sea teleconnections known to be related to broad-scale, extratropical steering circulation at the monthly scale. Results of that work suggested that the method allows for notable improvements in the calculation of area and circularity of the 500-hPa manifestation of …

The Magellan-Tess Survey. I. Survey Description And Midsurvey Results, Johanna Teske, Sharon Xuesong Wang, Angie Wolfgang, Tianjun Gan, Mykhaylo Plotnykov6, David J. Armstrong, R. Paul Butler, Bryson Cale, Jeffrey D. Crane, Ward Howard, Eric L. N. Jensen, Nicholas Law, Stephen A. Shectman, Peter Plavchan, Diana Valencia, Andrew Vanderburg, George R. Ricker, Roland Vanderspek, David W. Latham, Sara Seager, Joshua N. Winn, Jon M. Jenkins, Vardan Adibekyan, David Barrado, Susana C. C. Barros, Zouhair Benkhaldoun, David J. A. Brown, Edward M. Bryant, Jennifer Burt, Douglas A. Caldwell, David Charbonneau, Ryan Cloutier, Karen A. Collins, Kevin I. Collins, Knicole D. Colon, Dennis M. Conti, Olivier D. S. Demangeon, Jason D. Eastman, Mohammed Elmufti, Fabo Feng, Erin Flowers, Natalia M. Guerrero, Saeed Hojjatpanah, Jonathan M. Irwin, Giovanni Isopi, Jorge Lillo-Box, Franco Mallia, Bob Massey, Mayuko Mori, Susan E. Mullally, Norio Narita, Taku Nishiumi, Ares Osborn, Martin Paegert, Jerome Pitogo De Leon, Samuel N. Quinn, Michael Reefe, Richard P. Schwarz, Avi Shporer, Abderahmane Soubkiou, Sérgio G. Sousa, Chris Stockdale, Paul A. Strøm, Thiam-Guan Tan, Jiaxin Tang, Peter Tenenbaum, Peter J. Wheatley, Justin Wittrock, Daniel A. Yahalomi, Farzaneh Zohrabi45

Faculty Publications

Kepler revealed that roughly one-third of Sunlike stars host planets orbiting within 100 days and between the size of Earth and Neptune. How do these planets form, what are they made of, and do they represent a continuous population or multiple populations? To help address these questions, we began the Magellan-TESS Survey (MTS), which uses Magellan II/PFS to obtain radial velocity (RV) masses of 30 TESS-detected exoplanets and develops an analysis framework that connects observed planet distributions to underlying populations. In the past, small-planet RV measurements have been challenging to obtain due to host star faintness and low RV semiamplitudes …

Datos Preliminares De La Temporada 2019 Del Proyecto De Investigación Arqueológica Cerro San Isidro, Distrito De Moro, Ancash, David Chicoine, Jeisen Navarro

Faculty Publications

No abstract provided.

Role Of Dissipative Effects In The Quantum Gravitational Onset Of Warm Starobinsky Inflation In A Closed Universe

Faculty Publications

A problematic feature of low-energy-scale inflationary models, such as Starobinsky inflation, in a spatially closed universe is the occurrence of a recollapse and a big crunch singularity before inflation can even set in. In a recent work, it was shown that this problem can be successfully resolved in loop quantum cosmology for a large class of initial conditions due to a nonsingular cyclic evolution and a hysteresislike phenomenon. However, for certain highly unfavorable initial conditions, the onset of inflation was still difficult to obtain. In this work, we explore the role of dissipative particle production, which is typical in warm …

Gaia Gral: Gaia Dr2 Gravitational Lens Systems. Vi. Spectroscopic Confirmation And Modeling Of Quadruply Imaged Lensed Quasars, D Stern, S G. Djorgovski, A Krone-Martins, D Sluse, D Stern, C Ducourant, R Teixeira, J Surdej, C Boehm, B R. Den, D O. J, D R. D, G A. A, G R. L, J A. Mj, K L. P, L L. J, J F. Campion, A Mahabal, F Mignard, T Murphy, A Nierenberg, S Scarano, J Simon, J Slezak, C Spindola-Duarte, J Wambsganss

Faculty Publications

Combining the exquisite angular resolution of Gaia with optical light curves and WISE photometry, the Gaia Gravitational Lenses group (GraL) uses machine-learning techniques to identify candidate strongly lensed quasars, and has confirmed over two dozen new strongly lensed quasars from the Gaia Data Release 2. This paper reports on the 12 quadruply imaged quasars identified by this effort to date, which is a similar to 20% increase in the total number of confirmed quadruply imaged quasars. We discuss the candidate selection, spectroscopic follow-up, and lens modeling. We also report our spectroscopic failures as an aid for future investigations.

Simulating Highly Eccentric Common Envelope Jet Supernova Impostors, Shlomi Hillel, Ron Schreier, Sagiv Shiber, Noam Soker

Faculty Publications

We conduct three-dimensional hydrodynamical simulations of ecceniric common envelope jet supernova (CEJSN) impostors, i.e. a neutron star that crosses through the envelope of a red supergiant star on a highly eccentric orbit and launches jets as it accretes mass from the envelope. Because of numerical limitations, we apply a simple prescription where we inject the assumed jets' power into two opposite conical regions inside the envelope. We find the outflow morphology to be very complicated, clumpy, and non-spherical, having a large-scale symmetry only about the equatorial plane. The outflow morphology can substantially differ between simulations that differ by their jets' …

All-Sky Search For Long-Duration Gravitational-Wave Bursts In The Third Advanced Ligo And Advanced Virgo Run, #Ref!

Faculty Publications

After the detection of gravitational waves from compact binary coalescences, the search for transient gravitational-wave signals with less well-defined waveforms for which matched filtering is not well suited is one of the frontiers for gravitational-wave astronomy. Broadly classified into short less than or similar to 1 s and long greater than or similar to 1 s duration signals, these signals are expected from a variety of astrophysical processes, including non-axisymmetric deformations in magnetars or eccentric binary black hole coalescences. In this work, we present a search for long-duration gravitational-wave transients from Advanced LIGO and Advanced Virgo's third observing run from …

An Earth-Mass Planet In A Time Of Covid-19: Kmt-2020-Blg-0414lb, Leandro De Almeida, Andrew Gould, Cheongho Han, Iona Kondo, Chung-Uk Lee, Shude Mao, Yossi Shvartzvald, Jennifer C. Yee, Weicheng Zang, Xiangyu Zhang

Faculty Publications

We report the discovery of KMT-2020-BLG-0414Lb, with a planet-to-host mass ratio q (2) = 0.9-1.2 x 10(-5) = 3-4 circle plus at 1 sigma, which is the lowest mass-ratio microlensing planet to date. Together with two other recent discoveries (4 less than or similar to q/q (circle plus) less than or similar to 6), it fills out the previous empty sector at the bottom of the triangular (log s, log q) diagram, where s is the planet-host separation in units of the angular Einstein radius theta E. Hence, these discoveries call into question the existence, or at least the strength, …

Searches For Continuous Gravitational Waves From Young Supernova Remnants In The Early Third Observing Run Of Advanced Ligo And Virgo, R Abbott, T D. Abbott, S Abraham, F Acernese, R Abbott, A Adams, C Adams, R X. Adhikari, V B. Adya, C Affeldt, D Agarwal, M Agathos, K Agatsuma, N Aggarwal, O D. Aguiar, L Aiello, A Ain, P Ajith, T Akutsu, K M. Aleman, G Allen, A Allocca, P A. Altin, A Amato, S B. Anand, A Ananyeva, S B. Anderson, W G. Anderson, M Ando, S V. Angelova, S Ansoldi, J M. Antelis, S Antier, S Appert

Faculty Publications

We present results of three wide-band directed searches for continuous gravitational waves from 15 young supernova remnants in the first half of the third Advanced LIGO and Virgo observing run. We use three search pipelines with distinct signal models and methods of identifying noise artifacts. Without ephemerides of these sources, the searches are conducted over a fRequency band spanning from 10 to 2 kHz. We find no evidence of continuous gravitational radiation from these sources. We set upper limits on the intrinsic signal strain at 95% confidence level in sample subbands, estimate the sensitivity in the full band, and derive …

Everything You Wanted To Know About Space Radiation But Were Afraid To Ask, Jeffery Chancellor, Craig Nowadly, Jacqueline Williams, Serena Aunon-Chancellor, Megan Chesal, Jayme Looper, Wayne Newhauser

Faculty Publications

The space radiation environment is a complex combination of fast-moving ions derived from all atomic species found in the periodic table. The energy spectrum of each ion species varies widely but is prominently in the range of 400–600 MeV/n. The large dynamic range in ion energy is difficult to simulate in ground-based radiobiology experiments. Most ground-based irradiations with mono-energetic beams of a single one ion species are delivered at comparatively high dose rates. In some cases, sequences of such beams are delivered with various ion species and energies to crudely approximate the complex space radiation environment. This approximation may cause …

Lincoln’S Jewish Spy: The Life And Times Of Issachar Zacharie, Meg Groeling

Civil War Book Review

Lawrence Abel's book, Lincoln's Jewish Spy, is an "enjoyable read, artfully presenting this eccentric Victorian gentleman in his odd natural habitat, among the feet of the famous."

Editorial, Jeffery Hobson

Civil War Book Review

"Several writers whose works are reviewed" herein "tell previously untold stories, while others provide new analyses and narratives about widely studied people in the Civil War Era . . . The reviews, by junior and established scholars alike, note these enlightening works’ revelations about the dynamism and diversity of well-studied populations: Antebellum white northerners, 'politicized' white Confederate women, Freedpeople, and Confederate leaders and generals. Other reviewed books introduce previously undervalued and understudied characters from the Civil War Era: A John Brown co-conspirator, a pro-Confederate British politician, Lincoln’s foot-doctor cum spy, and the very environment in and around which the Civil …

The Untold Story Of Shields Green: The Life And Death Of A Harper's Ferry Raider, William S. King

Civil War Book Review

DeCaro’s interesting new book, The Untold Story of Shields Green; undertaken the author says, to restore in some sense “the life of…[a] man who lived.”

Illusions Of Emancipation: The Pursuit Of Freedom And Equality In The Twilight Of Slavery, Kathryn Angelica

Civil War Book Review

Joseph P. Reidy, in Illusions of Emancipation: The Pursuit of Freedom and Equality in the Twilight of Slavery, argues for viewing the process of emancipation as complex, uneven, and far reaching. Centering the testimony of formerly enslaved people and their understanding of wartime emancipation, Reidy demonstrates that the end of slavery in the United States took a winding, troubled, and uncertain path.

S21rs Sgcr No. 4 (Senate Vacancy, Amechi Obedechina), Alexandra Basse

Student Senate Enrolled Legislation

A Concurrent Resolution

To Appoint Amechi Obodechina as a Senator for the College of Music & Dramatic Arts

S21rs Sgcr No. 2 (Senate Vacancy, Harrison Cunningham), Alexandra Basse

Student Senate Enrolled Legislation

A Concurrent Resolution

To Appoint Harrison Cunningham as a Senator for the Graduate School

S21rs Sgcr No. 5 (Senate Vacancy, Evan Antie), Alexandra Basse

Student Senate Enrolled Legislation

A Concurrent Resolution

To Appoint Evan Antie as a Senator for the University Center for Advising & Counseling

S21rs Lo No. 2 (Director Of Communication, Nicole Nguyen), Marina Cole

Student Senate Enrolled Legislation

No abstract provided.

S21rs Sgcr No. 1 (Senate Vacancy, Abby Cramond), Alexandra Basse

Student Senate Enrolled Legislation

A Concurrent Resolution

To Appoint Abby Cramond as a Senator for the College of Agriculture

S21rs Lo No. 4 (Undersecretary, John Patrick), Marina Cole

Student Senate Enrolled Legislation

A Legislative Order

To Appoint John-Garrett Patrick as Undersecretary of the Fifty Third Student Senate of Louisiana State University

S21rs Lo No. 3 (Director Of Development, Xander Duplooy), Marina Cole

Student Senate Enrolled Legislation

A Legislative Order

To Appoint Xander du Plooy as Director of Development of the Fifty Third Student Senate of Louisiana State University

S21rs Lo No. 1 (Committees), Marina Cole

Student Senate Enrolled Legislation

A Legislative Order

To Appoint the Standing Committees of the Fifty Third Student Senate of Louisiana State University

Colossal Ambitions: Confederate Planning For A Post-Civil War World, Paul D. Escott

Civil War Book Review

Adrian Brettle pushes "revisionist" interpretations of the Confederate state "another important step farther. Colossal Ambitions is a thorough examination of confident, expansionist ideas about the Confederate future." Learn more about Brettle's book in my interview with him, which you can find on the homepage.

S21rs Sgr No. 4 (Spirit Squad), Xander Du Plooy

Student Senate Enrolled Legislation

A Resolution

To Urge and Request LSU to safely support and aid in the Spirit Squads being able to compete in Nationals this April.

S21rs Sgr No. 3 (Rouses), Craddock, Quadir, Taylor, Staggs, Patel, Nguyen, Pallotta, Landry, Perrodin, Dohrenwend

Student Senate Enrolled Legislation

A Resolution

To Urge LSU Administration to request for “Rouses Markets” to address the LSU community, in light of recent controversy among the LSU community, to reassure their commitment to diversity, democracy, inclusivity, and promotion of truth.

S21rs Sgr No. 5 (Mardi Gras Break), Staggs, Bowman, Reed, Loy, Addeo, Lautigar, Cronin, Kohn, Obodechina, Parr

Student Senate Enrolled Legislation

A Resolution

To Urge and Request LSU Faculty to provide leisure on February 15th (the Monday before Mardi Gras) by either not counting attendance, no graded in class assignments, or no class if possible.

Colossal Ambitions: Confederate Planning For A Post-Civil War World, Adrian Brettle

Civil War Book Review

"[Confederate planners] saw themselves as imminently realistic, not as inviting retribution from Nemesis by outlandish pride. They saw themselves as, yes, this great enterprise--and they needed to."

S21rs Sgb No. 2 (Consitution), Alexandra Basse

Student Senate Enrolled Legislation

A Bill to Amend the LSU Student Government Governing Documents

Old Tip Vs. The Sly Fox: The 1840 Election And The Making Of A Partisan Nation, Christopher Childers

Civil War Book Review

Richard J. Ellis's Old Tip vs. The Sly Fox is now "the standard history of the contest between Martin Van Buren and William Henry Harrison. Every student of the early republic should read this account of how the Log Cabin Campaign was about style and substance."

Into Tennessee And Failure: John Bell Hood, Andrew S. Bledsoe

Civil War Book Review

Stephen Davis's Into Tennessee and Failure: John Bell Hood offers a "wide-ranging assessment of primary sources, secondary literature, and historiography" that "represents the most detailed and rigorous portrait of Hood the general that we currently have."