Article
Astronomy & Astrophysics
Tomonori Totani
Summary: Searching for extraterrestrial life is important, but detecting it through remote sensing of exoplanet atmospheres is challenging. An alternative approach is to collect grains ejected from exoplanets and bring them back to the Solar System. These grains, which may contain biosignatures, could be collected in space or extracted from Antarctic ice or deep-sea sediments.
INTERNATIONAL JOURNAL OF ASTROBIOLOGY
(2023)
Article
Astronomy & Astrophysics
Steven J. Desch, Alan P. Jackson
Summary: The existence of interstellar objects 1I/'Oumuamua and 2I/Borisov confirms the possibility of interstellar panspermia. The origin of 'Oumuamua is still debated, but the hypothesis of N-2 ice fragments is the only one that is falsifiable, plausible, and consistent with observations. The possibility of interstellar panspermia would be higher if 'Oumuamua originated from a dwarf planet rather than a comet.
Article
Astronomy & Astrophysics
Bhavesh Jaiswal, Tyler D. Robinson
Summary: In this work, we analyze the impact of forward scattering effects from supermicron-sized aerosol particles on the transmission spectrum of exoplanets. We find that larger aerosol particles can significantly affect exoplanet transits and the strength of these effects may vary with wavelength. In certain cloud configurations, forward-scattered light can pass through the clouds unhindered, resulting in transparent clouds. The dependence of aerosol scattering properties on wavelength can lead to positive slopes in the transit spectrum.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
Christopher P. McKay, Paul C. W. Davies, Simon P. Worden
Summary: The possibility of habitable planets being common but life being rare is discussed in the article. If future telescopes confirm this, humans may consider seeding lifeless planets with resilient organisms or synthetic forms in order to ensure their survival. One potential method to achieve this is by using interstellar comets to transport microbial cargoes to nearby planetary systems. Conversely, it is also speculated that terrestrial life may have been intentionally seeded in this manner, which could be tested by finding evidence of common biochemical signatures on other Solar System bodies.
Article
Astronomy & Astrophysics
Brendan J. McKee, Benjamin T. Montet
Summary: The planets in the TOI-216 system previously showed significant variations in transit timing, allowing for precise mass characterization. In initial observations, TOI-216 b had grazing transits, making it difficult to measure its radius. However, new observations reveal that the planet's orbit has precessed and it is now fully transiting, enabling accurate measurements of its radius. TOI-216 b is a puffy Neptune-mass planet with a radius of 7.84 (-0.19)(+0.21) R-circle plus and a density of 0.201 +/- 0.017 g cm(-3). Numerical integration of the system's observations allows for updated and refined mass and orbit calculations, with uncertainties now primarily due to uncertainties in the stellar parameters. TOI-216 b represents a growing class of super-puff planets in orbital resonances, suggesting their early evolution is influenced by smooth disk migration.
ASTRONOMICAL JOURNAL
(2023)
Article
Astronomy & Astrophysics
Shang-Min Tsai, Hamish Innes, Tim Lichtenberg, Jake Taylor, Matej Malik, Katy Chubb, Raymond Pierrehumbert
Summary: The majority of discovered exoplanets are smaller than Neptune and larger than Earth, with H-2-rich atmospheres being prime targets for atmospheric characterization. Trace gases like ammonia and hydrogen cyanide are proposed proxies for the presence of a shallow surface on sub-Neptunes. Methanol is identified as another complementary proxy for surface characteristics.
ASTROPHYSICAL JOURNAL LETTERS
(2021)
Article
Astronomy & Astrophysics
Christopher Mann, David Lafreniere, Diana Dragomir, Samuel N. Quinn, Thiam-Guan Tan, Karen A. Collins, Steve B. Howell, Carl Ziegler, Andrew W. Mann, Keivan G. Stassun, Martti H. Kristiansen, Hugh Osborn, Tabetha Boyajian, Nora Eisner, Coel Hellier, George R. Ricker, Roland Vanderspek, David W. Latham, S. Seager, Joshua N. Winn, Jon M. Jenkins, Jesus Noel Villasenor, Brian McLean, Pamela Rowden, Guillermo Torres, Douglas A. Caldwell, Kevin I. Collins, Richard P. Schwarz
Summary: We validated the existence of a long-period transiting sub-Neptune planet, TOI-1221 b (TIC 349095149.01), with a period of 91.68278 (+0.00032)(-0.00041) days, orbiting a Sun-like star. We used various observations and analysis methods to confirm its existence and rule out false-positive sources. Additionally, we found evidence of potential non-transiting planets through oscillatory transit timing variations.
ASTRONOMICAL JOURNAL
(2023)
Article
Geochemistry & Geophysics
Leonardo Carrer, Dustin M. Schroeder, Andrew Romero-Wolf, Paul A. Ries, Lorenzo Bruzzone
Summary: The article investigates the impact of Jovian DAM characteristics on radar sounding performance, evaluating recent radio spectra and selected radar missions for Ganymede and Europa. Results show that Jovian DAM is not perfectly white noise and has variable occurrence probabilities, with sporadic occurrence in some frequency ranges.
IEEE TRANSACTIONS ON GEOSCIENCE AND REMOTE SENSING
(2021)
Article
Astronomy & Astrophysics
Szilard Kalman, Gyula M. Szabo, Luca Borsato, Attila Bodi, Andras Pal, Robert Szabo
Summary: The recent confirmation of several exoplanets residing in the "sub-Jovian/Neptune desert" has transformed it into a "savanna" with "giraffe" planets like LTT 9779 b and TOI-674 b. This article emphasizes the importance of studying these processes and presents three specific targets for observing them in the infrared range, which could improve our understanding of planetary formation/evolution.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
Tobias G. Meier, Dan J. Bower, Tim Lichtenberg, Paul J. Tackley, Brice-Olivier Demory
Summary: The study utilizes observations from the thermal phase curve of LHS 3844b to analyze the planet's interior dynamics and tectonic regimes through numerical models. Three viable convective regimes are identified, with the observation of hemispheric tectonics in certain scenarios.
ASTROPHYSICAL JOURNAL LETTERS
(2021)
Article
Astronomy & Astrophysics
Caroline Dorn, Tim Lichtenberg
Summary: The deep volatile storage capacity of magma oceans has significant implications for exoplanet mass and radius data. Experimental petrology provides fundamental properties of water and melt mixing ability. An advanced interior model for water-rich rocky exoplanets has been introduced to test the effects of rock melting and water partitioning on planet radii. Models with and without these processes can lead to deviations in planet radius up to 16%, indicating potential underestimation of planetary bulk water content.
ASTROPHYSICAL JOURNAL LETTERS
(2021)
Article
Astronomy & Astrophysics
Adina D. Feinstein, Trevor J. David, Benjamin T. Montet, Daniel Foreman-Mackey, John H. Livingston, Andrew W. Mann
Summary: V1298 Tau, a young star hosting four exoplanets, provides an opportunity to study the evolution of planetary radii in the same stellar environment. Recent observations suggest that the radii of the planets vary at different separations. This research is important for understanding the evolution of planets in a stellar environment.
ASTROPHYSICAL JOURNAL LETTERS
(2022)
Article
Astronomy & Astrophysics
William C. Waalkes, Zachory K. Berta-Thompson, Karen A. Collins, Adina D. Feinstein, Benjamin M. Tofflemire, Barbara Rojas-Ayala, Michele L. Silverstein, Elisabeth Newton, George R. Ricker, Roland Vanderspek, David W. Latham, S. Seager, Joshua N. Winn, Jon M. Jenkins, Jessie Christiansen, Robert F. Goeke, Alan M. Levine, H. P. Osborn, S. A. Rinehart, Mark E. Rose, Eric B. Ting, Joseph D. Twicken, Khalid Barkaoui, Jacob L. Bean, Cesar Briceno, David R. Ciardi, Kevin Collins, Dennis Conti, Tianjun Gan, Michael Gillon, Giovanni Isopi, Emmanuel Jehin, Eric L. N. Jensen, John F. Kielkopf, Nicholas Law, Franco Mallia, Andrew W. Mann, Benjamin T. Montet, Francisco J. Pozuelos, Howard Relles, Jessica E. Libby-Roberts, Carl Ziegler
Summary: TOI 122b and TOI 237b are two warm planets transiting inactive M dwarfs observed by TESS, with relatively nearby distances that make them potentially feasible targets for future studies.
ASTRONOMICAL JOURNAL
(2021)
Article
Astronomy & Astrophysics
C. Gonzalez Diaz, S. Aparicio Secanellas, G. M. Munoz Caro, J. J. Anaya Velayos, H. Carrascosa, M. G. Hernandez, V. Munoz-Iglesias, A. Marcos-Fernandez, O. Prieto-Ballesteros, O. Witasse, R. Lorente, N. Altobelli
Summary: The study of thermal properties of frozen salt solutions representative of ice layers in Jovian moons is crucial to support the JUICE and Europa Clipper missions. A series of experiments were conducted to measure the thermal conductivity of specific salt solutions and spot phase changes in the frozen salt solutions.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
Jared C. Siegel, Leslie A. Rogers
Summary: Prospects for expanding mass measurements of the Kepler sample are limited. However, a method of constraining planet mass in multiplanet systems using low signal-to-noise ratio (S/N) transit timing variations (TTVs) has been developed and shown to be effective in inferring informative upper bounds on planet mass and determining bulk composition.
ASTRONOMICAL JOURNAL
(2022)
Article
Geology
Ewa Budziszewska-Karwowska, Anna Bujok, Grzegorz Sadlok
Article
Paleontology
Grzegorz Sadlok
NEUES JAHRBUCH FUR GEOLOGIE UND PALAONTOLOGIE-ABHANDLUNGEN
(2019)
Article
Paleontology
Grzegorz Sadlok, Krzysztof Pawelczyk
Summary: Swimming tetrapods leave trace fossils underwater, providing evidence of their swim behavior. The swim techniques of tetrapods depend on their functional morphologies, which can be revealed through examination of swim trace fossils. Two types of swim traces have been identified in the Baranow Formation, pointing to different swim techniques utilized by terrestrial archosaurs and amphibious tetrapods.
Article
Biodiversity Conservation
Grzegorz Sadlok, Michal Zaton
PALAEOBIODIVERSITY AND PALAEOENVIRONMENTS
(2020)
Article
Paleontology
Grzegorz Sadlok
NEUES JAHRBUCH FUR GEOLOGIE UND PALAONTOLOGIE-ABHANDLUNGEN
(2020)
Article
Paleontology
Grzegorz Sadlok
Summary: Trackways left in dune sand are ephemeral due to wind and avalanching, but sub-0 degrees C temperatures combined with water can create a temporary ice cementation layer that preserves the footprints. This shows that sub-0 degrees C temperatures can play both positive and negative roles in the preservation of eolian tracks.
ICHNOS-AN INTERNATIONAL JOURNAL FOR PLANT AND ANIMAL TRACES
(2021)
Article
Paleontology
Grzegorz Sadlok
Summary: Carnivores leave bite traces on bones while feeding, classified as predichnia or non-predatory feeding traces. This study describes tooth-made ichnofossils from the Triassic Grabowa Formation and proposes a new ethological category, sarcophagichnia, for these carnivorous behaviors recorded in fossils. The studied bite traces were inflicted postmortem and likely by scavengers, reflecting postmortem food-processing behaviors such as dismembering and defleshing.
JOURNAL OF PALEONTOLOGY
(2022)
Article
Geology
Grzegorz Sadlok
ANNALES SOCIETATIS GEOLOGORUM POLONIAE
(2014)
Article
Geology
Grzegorz Sadlok
ANNALES SOCIETATIS GEOLOGORUM POLONIAE
(2013)
Article
Geology
Grzegorz Sadlok
ANNALES SOCIETATIS GEOLOGORUM POLONIAE
(2014)
Article
Geology
Grzegorz Sadlok, Zuzanna Wawrzyniak
ANNALES SOCIETATIS GEOLOGORUM POLONIAE
(2013)
Article
Geology
Grzegorz Sadlok, Marcin Machalski
ACTA GEOLOGICA POLONICA
(2010)
Article
Geology
Grzegorz Sadlok
ACTA GEOLOGICA POLONICA
(2010)
