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Solar differential rotation coefficients fitted from synoptic magnetic maps
Chu, Zhe; Gu, Haihua
Based on the consecutive synoptic magnetic maps, we devise a new method to calculate the solar differential rotation coefficients. This method is very easy to implement and has a high accuracy. Firstly, based on the two-term or three-term differential rotation formula, we simulate a synoptic map CR$_{n}$ evolves one Carrington Rotation (CR) time o…
Low CI/CO abundance ratio revealed by HST UV spectroscopy of CO-rich debris discs
Hughes, A. Meredith; Redfield, Seth; Roberge, Aki +6 more
The origin and evolution of CO gas in debris discs has been debated since its initial detection. The gas could have a primordial origin, as a remnant of the protoplanetary disc or a secondary exocometary origin. This paper investigates the origin of gas in two debris discs, HD110058 and HD131488, using Hubble Space Telescope (HST) observations of …
Using 26 Al to detect ongoing self-enrichment in young massive star clusters
Forbrich, Jan; Yates, Robert M.; Siegert, Thomas +5 more
Self-enrichment is one of the leading explanations for chemical anomalies in globular clusters. In this scenario, various candidate polluter stars have been proposed to eject gas with altered chemical composition during the self-enrichment process. Most of the proposed polluters will also eject radioactive
COBIPULSE: A Systematic Search for Compact Binary Millisecond Pulsars
Miles-Páez, Paulo A.; Turchetta, Marco; Simpson, Jordan A. +5 more
We report here the results obtained from a systematic optical photometric survey aimed at finding new compact binary millisecond pulsars (also known as "spiders"): the COmpact BInary PULsar SEarch. We acquired multiband optical images over 1 yr around 33 unidentified Fermi Large Area Telescope sources, selected as pulsar candidates based on their …
Enhanced Oxygen Ion Outflow at Earth and Mars due to the Concurrent Impact of a Stream Interaction Region
Thampi, Smitha V.; Bhaskar, Ankush; Venkataraman, V. +1 more
One of the major processes that solar wind drives is the outflow and escape of ions from the planetary atmospheres. The major ion species in the upper ionospheres of both Earth and Mars is O+, and hence it is more likely to dominate the escape process. On Earth, due to a strong intrinsic magnetic field, the major ion outflow pathways ar…
The accreted galaxy: An overview of TESS metal-poor accreted star candidates
Hawkins, Keith; Jofré, Paula; de Brito Silva, Danielle +2 more
The Milky Way is a mosaic of stars from different origins. In particular, metal-poor accreted star candidates offer a unique opportunity to better understand the accretion history of the Milky Way. In this work, we aim to explore the assembly history of the Milky Way by investigating accreted stars in terms of their ages, dynamical properties, and…
Meridional Flow in the Solar Polar Caps Revealed by Magnetic Field Observation and Simulation
Hou, Yijun; Li, Ting; Yang, Shuhong +10 more
As a large-scale motion on the Sun, the meridional flow plays an important role in determining magnetic structure and strength and solar cycle. However, the meridional flow near the solar poles is still unclear. The Hinode observations show that the magnetic flux density in polar caps decreases from the lower latitudes to the poles. Using a surfac…
Solar Radio Burst Prediction Based on a Multimodal Model
Feng, S. W.; Wang, Y. H.; Wang, J. +5 more
Solar radio bursts are intense radio radiation sources that occur during the energy-release process and represent a hot topic in solar-physics and space-weather research. In this paper, we present a multimode prediction model for daily solar radio bursts. The model uses deep learning and machine learning to obtain data information from different d…
An Analysis of the Complex and Compact Outflow Cavity Carved by HOPS 361-A in NGC 2071 IR
Narang, Mayank; Coudé, Simon; Quillen, Alice C. +10 more
We present a combined Stratospheric Observatory for Infrared Astronomy (SOFIA) and two-epoch Hubble Space Telescope (HST) study of the region NGC 2071 IR containing the outflow from the protostar HOPS 361-A (NGC 2071 IRS 1). New [O I] 63 µm spectra, taken with the German REciever for Astronomy at Terahertz frequencies (GREAT) instrument aboa…
Revisiting the massive star-forming complex RCW 122: New millimeter and submillimeter study
Baume, G.; Gamen, R.; Merello, M. +9 more
In this paper, we present a new multifrequency study of the giant star-forming complex RCW 122. We used molecular data obtained with the ASTE 10 m and the APEX 12 m telescopes, along with infrared observations spanning from 3.6 µm to 870 µm, obtained from available databases. We also incorporated a range of public datasets, including the radio con…