Results 111 to 120 of about 211,186 (262)

JWST MIRI MRS Observations of T Cha: Discovery of a Spatially Resolved Disk Wind

open access: yesThe Astronomical Journal
Understanding when and how circumstellar disks disperse is crucial to constrain planet formation and migration. Thermal winds powered by high-energy stellar photons have long been theorized to drive disk dispersal.
Naman S. Bajaj   +10 more
doaj   +1 more source

Statistical Distribution Function of Orbital Spacings in Planetary Systems

open access: yesThe Astronomical Journal
The minimum orbital separation of planets in long-stable planetary systems is often modeled as a step function, parameterized with a single value ${{\rm{\Delta }}}_{\min }$ (measured in mutual Hill radius of the two neighboring planets).
Jeremy Dietrich   +2 more
doaj   +1 more source

Impact of Annually Variable Dust Activity on the Recession of the Martian South Polar Seasonal Cap

open access: yesThe Astronomical Journal
Suspended dust is a vital component of Martian climatic system and its temporal-spatial variation can influence the recession of the South Polar Seasonal Cap (SPSC).
Zhibin Li   +9 more
doaj   +1 more source

Lunar crater analysis as an alternative tool for physics and astronomy teaching

open access: gold, 2020
Ibson José Maciel Leite   +4 more
openalex   +1 more source

Astronomy on the Moon: Geological considerations [PDF]

open access: yes
The Moon is an excellent site for astronomical observations. This paper describes two geological aspects related to astronomy from the Moon. First it evaluates the sources of gases near a lunar base as input to calculations reported in a separate paper ...
Taylor, G. Jeffrey
core   +1 more source

Pixel-level Terrain Processing of the Martian Surface from Moderate Resolution Images of Tianwen-1

open access: yesThe Astronomical Journal
The moderate-resolution camera (MoRIC) of the Tianwen-1 orbiter, China’s first Mars exploration mission, is a frame-imaging scheme color camera. However, generating a precise digital elevation model (DEM) from these images faces challenges due to the ...
Dingxin Liu   +5 more
doaj   +1 more source

JWST Captures a Sudden Stellar Outburst and Inner Disk Wall Destruction

open access: yesThe Astrophysical Journal
We analyze JWST/MIRI observations of T Cha, a highly variable (Δ V ∼ 3–5 mag) accreting Sun-like star surrounded by a disk with a large (∼15 au) dust gap. We find that the JWST mid-IR spectrum is significantly different from the Spitzer spectrum obtained
Chengyan Xie   +8 more
doaj   +1 more source

Multi-use lunar telescopes [PDF]

open access: yes
The objective of multi-use telescopes is to reduce the initial and operational costs of space telescopes to the point where a fair number of telescopes, a dozen or so, would be affordable.
Boyd, Louis   +7 more
core   +1 more source

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