Smithsonian Digital Repository: Recent submissions

  • Search for the Epoch of Reionization with HERA: upper limits on the closure phase delay power spectrum 
    Keller, Pascal M.; Nikolic, Bojan; Thyagarajan, Nithyanandan; Carilli, Chris L.; Bernardi, Gianni; Charles, Ntsikelelo; Bester, Landman; Smirnov, Oleg M.; Kern, Nicholas S.; Dillon, Joshua S.; Hazelton, Bryna J.; Morales, Miguel F.; Jacobs, Daniel C.; Parsons, Aaron R.; Abdurashidova, Zara; Adams, Tyrone; Aguirre, James E.; Alexander, Paul; Ali, Zaki S.; Baartman, Rushelle; Balfour, Yanga; Beardsley, Adam P.; Billings, Tashalee S.; Bowman, Judd D.; Bradley, Richard F.; Bull, Philip; Burba, Jacob; Carey, Steven; Cheng, Carina; DeBoer, David R.; de Lera Acedo, Eloy; Dexter, Matt; Eksteen, Nico; Ely, John; Ewall-Wice, Aaron; Fagnoni, Nicolas; Fritz, Randall; Furlanetto, Steven R.; Gale-Sides, Kingsley; Glendenning, Brian; Gorthi, Deepthi; Greig, Bradley; Grobbelaar, Jasper; Halday, Ziyaad; Hewitt, Jacqueline N.; Hickish, Jack; Julius, Austin; Kariseb, MacCalvin; Kerrigan, Joshua; Kittiwisit, Piyanat; Kohn, Saul A.; Kolopanis, Matthew; Lanman, Adam; Plante, Paul La; Liu, Adrian; Loots, Anita; Ma, Yin-Zhe; MacMahon, David Harold Edward; Malan, Lourence; Malgas, Cresshim; Malgas, Keith; Marero, Bradley; Martinot, Zachary E.; Mesinger, Andrei; Molewa, Mathakane; Mosiane, Tshegofalang; Murray, Steven G.; Neben, Abraham R.; Nuwegeld, Hans; Pascua, Robert; Patra, Nipanjana; Pieterse, Samantha; Pober, Jonathan C.; Razavi-Ghods, Nima; Robnett, James; Rosie, Kathryn; Santos, Mario G.; Sims, Peter; Smith, Craig; Swarts, Hilton; Van Wyngaarden, Pieter; Williams, Peter K. G.; Zheng, Haoxuan (2023)
    Radio interferometers aiming to measure the power spectrum of the redshifted 21 cm line during the Epoch of Reionization (EoR) need to achieve an unprecedented dynamic range to separate the weak signal from overwhelming ...
  • Classification of Chandra X-Ray Sources in Cygnus OB2 
    Kashyap, Vinay L.; Guarcello, Mario G.; Wright, Nicholas J.; Drake, Jeremy J.; Flaccomio, Ettore; Aldcroft, Tom L.; Albacete Colombo, Juan F.; Briggs, Kevin; Damiani, Francesco; Drew, Janet E.; Martin, Eduardo L.; Micela, Giusi; Naylor, Tim; Sciortino, Salvatore (2023)
    We have devised a predominantly Naive Bayes-based method to classify X-ray sources detected by Chandra in the Cygnus OB2 association into members, foreground objects, and background objects. We employ a variety of X-ray, ...
  • Key Science Goals for the Next-Generation Event Horizon Telescope 
    Johnson, Michael D.; Akiyama, Kazunori; Blackburn, Lindy; Bouman, Katherine L.; Broderick, Avery E.; Cardoso, Vitor; Fender, Rob P.; Fromm, Christian M.; Galison, Peter; Gómez, José L.; Haggard, Daryl; Lister, Matthew L.; Lobanov, Andrei P.; Markoff, Sera; Narayan, Ramesh; Natarajan, Priyamvada; Nichols, Tiffany; Pesce, Dominic W.; Younsi, Ziri; Chael, Andrew; Chatterjee, Koushik; Chaves, Ryan; Doboszewski, Juliusz; Dodson, Richard; Doeleman, Sheperd S.; Elder, Jamee; Fitzpatrick, Garret; Haworth, Kari; Houston, Janice; Issaoun, Sara; Kovalev, Yuri Y.; Levis, Aviad; Lico, Rocco; Marcoci, Alexandru; Martens, Niels C. M.; Nagar, Neil M.; Oppenheimer, Aaron; Palumbo, Daniel C. M.; Ricarte, Angelo; Rioja, María J.; Roelofs, Freek; Thresher, Ann C.; Tiede, Paul; Weintroub, Jonathan; Wielgus, Maciek (2023)
    The Event Horizon Telescope (EHT) has led to the first images of a supermassive black hole, revealing the central compact objects in the elliptical galaxy M87 and the Milky Way. Proposed upgrades to this array through the ...
  • Kepler's last planet discoveries: two new planets and one single-transit candidate from K2 campaign 19 
    Incha, Elyse; Vanderburg, Andrew; Jacobs, Tom; LaCourse, Daryll; Bieryla, Allyson; Pass, Emily; Howell, Steve B.; Berlind, Perry; Calkins, Michael L.; Esquerdo, Gilbert; Latham, David W.; Mann, Andrew W. (2023)
    The Kepler space telescope was responsible for the discovery of over 2700 confirmed exoplanets, more than half of the total number of exoplanets known today. These discoveries took place during both Kepler's primary mission, ...
  • Geographic barriers but not life history traits shape the phylogeography of North American mammals 
    Jensen, Alex J.; Cove, Michael V.; Goldstein, Benjamin R.; Kays, Roland; McShea, William J.; Pacifici, Krishna; Rooney, Brigit R.; Kierepka, Elizabeth (2024)
    AimSynthesize literature on genetic structure within species to understand how geographic features and species traits influence past responses to climate change.LocationNorth America.Time PeriodWe synthesized phylogeographic ...
  • Enabling Transformational ngEHT Science via the Inclusion of 86 GHz Capabilities 
    Issaoun, Sara; Pesce, Dominic W.; Roelofs, Freek; Chael, Andrew; Dodson, Richard; Rioja, María J.; Akiyama, Kazunori; Aran, Romy; Blackburn, Lindy; Doeleman, Sheperd S.; Fish, Vincent L.; Fitzpatrick, Garret; Johnson, Michael D.; Narayanan, Gopal; Raymond, Alexander W.; Tilanus, Remo P. J. (2023)
    We present a case for significantly enhancing the utility and efficiency of the ngEHT by incorporating an additional 86 GHz observing band. In contrast to 230 or 345 GHz, weather conditions at the ngEHT sites are reliably ...
  • Dwarf galaxy archaeology from chemical abundances and star-formation histories 
    Johnson, James W.; Conroy, Charlie; Johnson, Benjamin D.; Peter, Annika H. G.; Cargile, Phillip A.; Bonaca, Ana; Naidu, Rohan P.; Woody, Turner; Ting, Yuan-Sen; Han, Jiwon Jesse; Speagle, Joshua S. (2023)
    We model the stellar abundances and ages of two disrupted dwarf galaxies in the Milky Way stellar halo: Gaia-Sausage Enceladus (GSE) and Wukong/LMS-1. Using a statistically robust likelihood function, we fit one-zone models ...
  • Making kin is more than metaphor: Implications of responsibilities toward Indigenous knowledge and artistic traditions for museums 
    Isaac, Gwyneira; Burgio-Ericson, Klint; McChesney, Lea; Green, Adriana Greci; Charley, Karen Kahe; Church, Kelly; Dillard, Renee Wasson (2024)
    Many Indigenous communities do not regard objects as inanimate, but rather as animate kin. Based on our work as a collaborative group of museum coordinators and Hopi, Anishinaabe, and Penobscot artists, we explore narratives ...
  • Functional differences between the extraordinary eyes of deep-sea hyperiid amphipods 
    Jessop, Anna-Lee; Bagheri, Zahra M.; Partridge, Julian C.; Osborn, Karen J.; Hemmi, Jan M. (2024)
    The ocean's midwater is a uniquely challenging yet predictable and simple visual environment. The need to see without being seen in this dim, open habitat has led to extraordinary visual adaptations. To understand these ...
  • Spectacular Nucleosynthesis from Early Massive Stars 
    Ji, Alexander P.; Curtis, Sanjana; Storm, Nicholas; Chandra, Vedant; Schlaufman, Kevin C.; Stassun, Keivan G.; Heger, Alexander; Pignatari, Marco; Price-Whelan, Adrian M.; Bergemann, Maria; Stringfellow, Guy S.; Fröhlich, Carla; Reggiani, Henrique; Holmbeck, Erika M.; Tayar, Jamie; Shah, Shivani P.; Griffith, Emily J.; Laporte, Chervin F. P.; Casey, Andrew R.; Hawkins, Keith; Horta, Danny; Cerny, William; Thibodeaux, Pierre; Usman, Sam A.; Amarante, João A. S.; Beaton, Rachael L.; Cargile, Phillip A.; Chiappini, Cristina; Conroy, Charlie; Johnson, Jennifer A.; Kollmeier, Juna A.; Li, Haining; Loebman, Sarah; Meynet, Georges; Bizyaev, Dmitry; Brownstein, Joel R.; Gupta, Pramod; Morrison, Sean; Pan, Kaike; Ramirez, Solange V.; Rix, Hans-Walter; Sánchez-Gallego, José (2024)
    Stars that formed with an initial mass of over 50 M <sub>?</sub> are very rare today, but they are thought to be more common in the early Universe. The fates of those early, metal-poor, massive stars are highly uncertain. ...
  • Chemical abundances of the Typhon stellar stream 
    Ji, Alexander P.; Naidu, Rohan P.; Brauer, Kaley; Ting, Yuan-Sen; Simon, Joshua D. (2023)
    We present the first high-resolution chemical abundances of seven stars in the recently discovered high-energy stream Typhon. Typhon stars have apocentres r ? 100 kpc, making this the first detailed chemical picture of the ...
  • Sub-m s<sup>-1</sup> upper limits from a deep HARPS-N radial-velocity search for planets orbiting HD 166620 and HD 144579 
    John, A. Anna; Collier Cameron, A.; Faria, J. P.; Mortier, A.; Wilson, T. G.; Malavolta, L.; Buchhave, L. A.; Dumusque, X.; López-Morales, M.; Haywood, R. D.; Rice, K.; Sozzetti, A.; Latham, D. W.; Udry, S.; Pepe, F.; Pinamonti, M.; Vanderburg, A.; Ghedina, A.; Cosentino, R.; Stalport, M.; Nicholson, B. A.; Fiorenzano, A.; Poretti, E. (2023)
    Minimizing the impact of stellar variability in radial velocity (RV) measurements is a critical challenge in achieving the 10 cm s<sup>-1</sup> precision needed to hunt for Earth twins. Since 2012, a dedicated programme ...
  • The influence of snow cover on Ozone Monitor Instrument formaldehyde observations 
    Howlett, CareyAnne; González Abad, Gonzalo; Miller, Christopher Chan; Nowlan, Caroline Rebecca; Ayazpour, Zolal; Zhu, Lei (2023)
    Formaldehyde (HCHO) is measured from space using backscattered ultraviolet sun-light. Because of HCHO's short lifetime, space-based observations of HCHO can serve as a proxy for volatile organic compounds, helping to ...
  • The long-term broad-line responsivity in MKN 110 
    Homan, D.; Lawrence, A.; Ward, M.; Bruce, A.; Landt, H.; MacLeod, C.; Elvis, M.; Wilkes, B.; Huchra, J. P.; Peterson, B. M. (2023)
    We examine the long-term history of the optical spectrum of the extremely variable Active Galactic Nucleus (AGN) MKN 110. By combining various archival data with new data, we cover an unprecedented long period of ~30 yr ...
  • Limits on Simultaneous and Delayed Optical Emission from Well-localized Fast Radio Bursts 
    Hiramatsu, Daichi; Berger, Edo; Metzger, Brian D.; Gomez, Sebastian; Bieryla, Allyson; Arcavi, Iair; Howell, D. Andrew; Mckinven, Ryan; Tominaga, Nozomu (2023)
    We present the largest compilation to date of optical observations during and following fast radio bursts (FRBs). The data set includes our dedicated simultaneous and follow-up observations, as well as serendipitous archival ...
  • Macrolitter and microplastics along the East Pacific coasts — A homemade problem needing local solutions 
    Honorato-Zimmer, Daniela; Escobar-Sánchez, Gabriela; Deakin, Katie; De Veer, Diamela; Galloway, Tamara; Guevara-Torrejón, Valeska; Howard, Jessica; Jones, Jen; Lewis, Ceri; Ribeiro, Francisca; Savage, Georgie; Thiel, Martin (2024)
  • A Search for Extragalactic Fast Blue Optical Transients in ZTF and the Rate of AT2018cow-like Transients 
    Ho, Anna Y. Q.; Perley, Daniel A.; Gal-Yam, Avishay; Lunnan, Ragnhild; Sollerman, Jesper; Schulze, Steve; Das, Kaustav K.; Dobie, Dougal; Yao, Yuhan; Fremling, Christoffer; Adams, Scott; Anand, Shreya; Andreoni, Igor; Bellm, Eric C.; Bruch, Rachel J.; Burdge, Kevin B.; Castro-Tirado, Alberto J.; Dahiwale, Aishwarya; De, Kishalay; Dekany, Richard; Drake, Andrew J.; Duev, Dmitry A.; Graham, Matthew J.; Helou, George; Kaplan, David L.; Karambelkar, Viraj; Kasliwal, Mansi M.; Kool, Erik C.; Kulkarni, S. R.; Mahabal, Ashish A.; Medford, Michael S.; Miller, A. A.; Nordin, Jakob; Ofek, Eran; Petitpas, Glen; Riddle, Reed; Sharma, Yashvi; Smith, Roger; Stewart, Adam J.; Taggart, Kirsty; Tartaglia, Leonardo; Tzanidakis, Anastasios; Winters, Jan Martin (2023)
    We present a search for extragalactic fast blue optical transients (FBOTs) during Phase I of the Zwicky Transient Facility (ZTF). We identify 38 candidates with durations above half-maximum light 1 day <sub>1/2</sub> < 12 ...
  • X-Ray Constraints on the Hot Gaseous Corona of Edge-on Late-type Galaxies in Virgo 
    Hou, Meicun; He, Lin; Hu, Zhensong; Li, Zhiyuan; Jones, Christine; Forman, William; Su, Yuanyuan; Wang, Jing; Ho, Luis C. (2024)
    We present a systematic study of the putative hot gas corona around late-type galaxies (LTGs) residing in the Virgo cluster, based on archival Chandra observations. Our sample consists of 21 nearly edge-on galaxies ...
  • Minutes-duration optical flares with supernova luminosities 
    Ho, Anna Y. Q.; Perley, Daniel A.; Chen, Ping; Schulze, Steve; Dhillon, Vik; Kumar, Harsh; Suresh, Aswin; Swain, Vishwajeet; Bremer, Michael; Smartt, Stephen J.; Anderson, Joseph P.; Anupama, G. C.; Awiphan, Supachai; Barway, Sudhanshu; Bellm, Eric C.; Ben-Ami, Sagi; Bhalerao, Varun; de Boer, Thomas; Brink, Thomas G.; Burruss, Rick; Chandra, Poonam; Chen, Ting-Wan; Chen, Wen-Ping; Cooke, Jeff; Coughlin, Michael W.; Das, Kaustav K.; Drake, Andrew J.; Filippenko, Alexei V.; Freeburn, James; Fremling, Christoffer; Fulton, Michael D.; Gal-Yam, Avishay; Galbany, Lluís; Gao, Hua; Graham, Matthew J.; Gromadzki, Mariusz; Gutiérrez, Claudia P.; Hinds, K. -Ryan; Inserra, Cosimo; A J, Nayana; Karambelkar, Viraj; Kasliwal, Mansi M.; Kulkarni, Shri; Müller-Bravo, Tomás E.; Magnier, Eugene A.; Mahabal, Ashish A.; Moore, Thomas; Ngeow, Chow-Choong; Nicholl, Matt; Ofek, Eran O.; Omand, Conor M. B.; Onori, Francesca; Pan, Yen-Chen; Pessi, Priscila J.; Petitpas, Glen; Polishook, David; Poshyachinda, Saran; Pursiainen, Miika; Riddle, Reed; Rodriguez, Antonio C.; Rusholme, Ben; Segre, Enrico; Sharma, Yashvi; Smith, Ken W.; Sollerman, Jesper; Srivastav, Shubham; Strotjohann, Nora Linn; Suhr, Mark; Svinkin, Dmitry; Wang, Yanan; Wiseman, Philip; Wold, Avery; Yang, Sheng; Yang, Yi; Yao, Yuhan; Young, David R.; Zheng, WeiKang (2023)
    In recent years, certain luminous extragalactic optical transients have been observed to last only a few days<sup>1</sup>. Their short observed duration implies a different powering mechanism from the most common luminous ...
  • The Temperature, Electron, and Pressure Characteristics of Switchbacks: Parker Solar Probe Observations 
    Huang, Jia; Kasper, Justin C.; Larson, Davin E.; McManus, Michael D.; Whittlesey, Phyllis; Livi, Roberto; Rahmati, Ali; Romeo, Orlando; Liu, Mingzhe; Jian, Lan K.; Verniero, Jaye L.; Velli, Marco; Badman, Samuel T.; Rivera, Yeimy J.; Niembro, Tatiana; Paulson, Kristoff; Stevens, Michael; Case, Anthony W.; Bowen, Trevor A.; Pulupa, Marc; Bale, Stuart D.; Halekas, Jasper S. (2023)
    Parker Solar Probe observes unexpectedly prevalent switchbacks, which are rapid magnetic field reversals that last from seconds to hours, in the inner heliosphere, posing new challenges to understanding their nature, origin, ...

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