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The Outburst of the Young Star Gaia19bey
The Astronomical Journal ( IF 5.1 ) Pub Date : 2020-09-11 , DOI: 10.3847/1538-3881/abad96
Klaus W. Hodapp 1 , Larry Denneau 2 , Michael Tucker 2 , Benjamin J. Shappee 2 , Mark E. Huber 2 , Anna V. Payne 2 , Aaron Do 2 , Chien-Cheng Lin 2 , Michael S. Connelley 1 , Watson P. Varricatt 1 , John Tonry 2 , Kenneth Chambers 2 , Eugene Magnier 2
Affiliation  

We report photometry and spectroscopy of the outburst of the young stellar object Gaia19bey. We have established the outburst light curve with archival Gaia G, ATLAS Orange, ZTF r-band and Pan-STARRS rizy-filter photometry, showing an outburst of approximately 4 years duration, longer than typical EXors but shorter than FUors. Its pre-outburst SED shows a flat far-infrared spectrum, confirming the early evolutionary state of Gaia19bey and its similarity to other deeply embedded young stars experiencing outbursts. A lower limit to the peak outburst luminosity is approximately 182 L_sun at an assumed distance of 1.4 kpc, the minimum plausible distance. Infrared and optical spectroscopy near maximum light showed an emission line spectrum, including HI lines, strong red CaII emission, other metal emission lines, infrared CO bandhead emission, and a strong infrared continuum. Towards the end of the outburst, the emission lines have all but disappeared and the spectrum has changed into an almost pure continuum spectrum. This indicates a cessation of magnetospheric accretion activity. The near-infrared colors have become redder as Gaia19bey has faded, indicating a cooling of the continuum component. Near the end of the outburst, the only remaining strong emission lines are forbidden shock-excited emission lines. Adaptive optics integral field spectroscopy shows the H_2 1--0 S(1) emission with the morphology of an outflow cavity and the extended emission in the [FeII] line at 1644 nm with the morphology of an edge-on disk. However, we do not detect any large-scale jet from Gaia19bey.

中文翻译:

年轻明星Gaia19bey的爆发

我们报告了年轻恒星天体 Gaia19bey 爆发的光度测量和光谱。我们已经使用存档的 Gaia G、ATLAS Orange、ZTF r-band 和 Pan-STARRS rizy-filter 光度法建立了爆发光曲线,显示爆发持续时间约为 4 年,比典型的 EXor 长但比 FUors 短。它爆发前的 SED 显示出平坦的远红外光谱,证实了 Gaia19bey 的早期演化状态及其与其他经历爆发的深埋年轻恒星的相似性。在假设距离为 1.4 kpc(最小合理距离)时,峰值爆发光度的下限约为 182 L_sun。近最大光的红外光谱和光学光谱显示出发射谱线,包括HI谱线、强红CaII发射谱线、其他金属发射谱线、红外CO波段发射谱线、和强烈的红外连续谱。在爆发即将结束时,发射线几乎消失了,光谱变成了几乎纯净的连续光谱。这表明磁层吸积活动停止。随着 Gaia19bey 的褪色,近红外颜色变得更红,表明连​​续谱组件的冷却。在爆发接近尾声时,唯一剩下的强发射线是禁止激波激发的发射线。自适应光学积分场光谱显示出具有流出腔形态的 H_2 1--0 S(1) 发射和在 1644 nm 处 [FeII] 线的扩展发射,具有边缘圆盘的形态。然而,我们没有探测到来自 Gaia19bey 的任何大型喷流。发射线几乎消失了,光谱变成了几乎纯的连续光谱。这表明磁层吸积活动停止。随着 Gaia19bey 的褪色,近红外颜色变得更红,表明连​​续谱组件的冷却。在爆发接近尾声时,唯一剩下的强发射线是禁止激波激发的发射线。自适应光学积分场光谱显示出具有流出腔形态的 H_2 1--0 S(1) 发射和在 1644 nm 处 [FeII] 线的扩展发射,具有边缘圆盘的形态。然而,我们没有探测到来自 Gaia19bey 的任何大型喷流。发射线几乎消失了,光谱变成了几乎纯的连续光谱。这表明磁层吸积活动停止。随着 Gaia19bey 的褪色,近红外颜色变得更红,表明连​​续谱组件的冷却。在爆发接近尾声时,唯一剩下的强发射线是禁止激激发射线。自适应光学积分场光谱显示出具有流出腔形态的 H_2 1--0 S(1) 发射和在 1644 nm 处 [FeII] 线的扩展发射,具有边缘圆盘的形态。然而,我们没有探测到来自 Gaia19bey 的任何大型喷流。随着 Gaia19bey 的褪色,近红外颜色变得更红,表明连​​续谱组件的冷却。在爆发接近尾声时,唯一剩下的强发射线是禁止激波激发的发射线。自适应光学积分场光谱显示出具有流出腔形态的 H_2 1--0 S(1) 发射和在 1644 nm 处 [FeII] 线的扩展发射,具有侧向圆盘的形态。然而,我们没有探测到来自 Gaia19bey 的任何大型喷流。随着 Gaia19bey 的褪色,近红外颜色变得更红,表明连​​续谱组件的冷却。在爆发接近尾声时,唯一剩下的强发射线是禁止激波激发的发射线。自适应光学积分场光谱显示出具有流出腔形态的 H_2 1--0 S(1) 发射和在 1644 nm 处 [FeII] 线的扩展发射,具有边缘圆盘的形态。然而,我们没有探测到来自 Gaia19bey 的任何大型喷流。自适应光学积分场光谱显示出具有流出腔形态的 H_2 1--0 S(1) 发射和在 1644 nm 处 [FeII] 线的扩展发射,具有边缘圆盘的形态。然而,我们没有探测到来自 Gaia19bey 的任何大型喷流。自适应光学积分场光谱显示出具有流出腔形态的 H_2 1--0 S(1) 发射和在 1644 nm 处 [FeII] 线的扩展发射,具有边缘圆盘的形态。然而,我们没有探测到来自 Gaia19bey 的任何大型喷流。
更新日期:2020-09-11
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