# Mid-infrared evolution of η Carinae from 1968 to 2018

@article{Mehner2019MidinfraredEO,
title={Mid-infrared evolution of $\eta$ Carinae from 1968 to 2018},
author={A. Mehner and W. J. de Wit and Daniel Asmus and P. W. Morris and Claudia Agliozzo and Michael J. Barlow and T R Gull and D. John Hillier and G. Weigelt},
journal={Astronomy \& Astrophysics},
year={2019}
}
η Car is one of the most luminous and massive stars in our Galaxy and is the brightest mid-IR source in the sky outside our solar system. Since the late 1990s, the central source has dramatically brightened at UV and optical wavelengths. This might be explained by a decrease in circumstellar dust extinction. We aim to establish the mid-IR flux evolution and further our understanding of the star’s UV and optical brightening. Mid-IR images from 8−20 μm were obtained in 2018 with VISIR at the Very… Expand
7 Citations

#### Paper Mentions

L etter to the E ditor Mid-infrared evolution of η Car from 1968 to 2018 ?
Eta Car is one of the most luminous and massive stars in our Galaxy and is the brightest mid-infrared (mid-IR) source in the sky, outside our solar system. Since the late 1990s the central source hasExpand
Eta carinae and the homunculus: far infrared/submillimetre spectral lines detected with the Herschel Space Observatory
The evolved massive binary star Eta Carinae underwent eruptive mass loss events that formed the complex bi-polar Homunculus nebula harboring tens of solar masses of unusually nitrogen-rich gas andExpand
CO, Water, and Tentative Methanol in η Carinae Approaching Periastron
In circumstellar gas, the complex organic molecule methanol has been found almost exclusively around young stellar objects, and is thus regarded as a signpost of recent star formation. Here we reportExpand
The Altered State of η Carinae: HST’s Photometric Record 1998–2021
• John C. Martin
• Physics
• Research Notes of the AAS
• 2021
Hubble Space Telescope photometry of η Carinae spans 23 yr, including five spectroscopic events. The rapid brightening rate decreased after 2010, and the spectroscopic events in 2014 and 2020 hadExpand
Characterization of the effect of atmospheric parameters on the infrared sky at the VLT
• Engineering, Environmental Science
• Astronomical Telescopes + Instrumentation
• 2020
Knowledge about the external environmental conditions on science data quality is an essential aspect of midinfrared ground-based observations. Before science observations are taken, a standard starExpand
Spectroscopic signatures of the vanishing natural coronagraph of Eta Carinae
Eta Carinae is a massive interacting binary system shrouded in a complex circumstellar environment whose evolution is the source of the long-term brightening observed during the last 80 years. AnExpand
The X-Ray Properties of Eta Carinae During Its 2020 X-Ray Minimum
• Physics
• 2020
The massive binary system Eta Carinae is characterized by intense colliding winds that form shocks and emit X-rays. The system is highly eccentric (e ≃ 0.9), resulting in modulated X-ray emissionExpand

#### References

SHOWING 1-10 OF 69 REFERENCES
Near-Infrared Evidence for a Sudden Temperature Increase in Eta Carinae
Aims. Eta Car's ultra-violet, optical, and X-ray light curves and its spectrum suggest a physical change in its stellar wind over the last decade. It was proposed that the mass-loss rate decreased byExpand
Distinguishing circumstellar from stellar photometric variability in Eta Carinae
The interacting binary Eta Carinae remains one of the most enigmatic massive stars in our Galaxy despite over four centuries of observations. In this work, its light curve from the ultraviolet to theExpand
Mass and Kinetic Energy of the Homunculus Nebula around η Carinae
We examine thermal infrared images of η Car at wavelengths from 4.8 to 25 μm obtained with the MIRAC3 camera system at the Magellan Observatory, and we conclude that η Car's circumstellar HomunculusExpand
Remarks about X-rays from Eta Carinae
• Physics
• 1972
TWO classes of models are current for η Carinae, a “star” which is perhaps the most luminous (∼1040 erg s−1) known within our Galaxy. According to one model this object is a very massive star, whichExpand
The sub-arcsecond dusty environment of Eta Carinae
The core of the nebula surrounding Eta Carinae has been observed with the VLT Adaptive Optics system NACO and with the interferometer VLTI/MIDI to constrain spatially and spectrally the warm dustyExpand
High-Excitation Emission Lines Near Eta Carinae, and Its Likely Companion Star
• Physics
• 2009
In order to study the distribution of gas and ionizing radiation around η Car and their implications for its likely companion star, we have examined high-excitation emission lines of [Ne III], [FeExpand
Submillimetre variability of Eta Carinae: cool dust within the outer ejecta
Previous submillimetre (submm) observations detected 0.7 M⊙ of cool dust emission around the luminous blue variable (LBV) star η Carinae. These observations were hindered by the low declination of ηExpand
The Chrysalis Opens? Photometry from the η Carinae Hubble Space Telescope Treasury Project, 2002-2006* **
• Physics
• 2006
During the past decade η Car has brightened markedly, possibly indicating a change of state. Here we summarize photometry gathered by the Hubble Space Telescope (HST) as part of the HST TreasuryExpand
A disrupted circumstellar torus inside η Carinae's homunculus nebula
We present thermal infrared images of the bipolar nebula surrounding η Carinae at six wavelengths from 4.8 to 24.5 μm. These were obtained with the MIRAC3 camera system at the Magellan Observatory.Expand
η CARINAE'S DUSTY HOMUNCULUS NEBULA FROM NEAR-INFRARED TO SUBMILLIMETER WAVELENGTHS: MASS, COMPOSITION, AND EVIDENCE FOR FADING OPACITY.
Using radiative transfer modeling, it is found that the two best-fit dust models yield compositions which are consistent with CNO-processed material, with iron, pyroxene and other metal-rich silicates, corundum, and magnesium-iron sulfide in common. Expand