Newly discovered very young star with a giant hot core

Artist rendition of protostar in MM3 (Credit: NAOJ)
Artist rendition of protostar in MM3 (Credit: NAOJ)

Main Point:

Scientists have found hot cloud of about 10 times the size of usual clouds found around the young stars or more appropriately you can say, around baby stars.

Study Further:

Infrared dark clouds (IRDCs):

IRDCs are dense regions of cold (i.e. about –436° Fahrenheit [–260° Celsius]) gas and dust clouds in which the stars are usually formed.

Temperature of central part of some of the clouds can reach up to the level of –256° Fahrenheit (–160° Celsius), so these clouds are called as “hot cores”. Some organic molecules such as such as methanol (CH3OH), ethyl cyanide (CH3CH2CN), and methyl formate (HCOOCH3) are found in abundance in the hot cores.

Research on IRDCs could help scientists in the study of star formation.

Astronomical Units (AUs):

It is a unit of astronomical distances especially within the solar system, equal to the mean distance between the Earth and the Sun, about 150 million km/93 million miles.

Present Research:

Scientists used the Atacama Large Millimeter/submillimeter Array (ALMA) to find hot molecular cloud named G34.43+00.24 MM3 (MM3) around the star in the constellation Aquila, the Eagle. This hot cloud is about 10 times larger than those of the usual solar-mass baby stars showing the diverse nature of star formation.

Methanol gas is emitted by the cloud having the temperature of about – 220° Fahrenheit (–140° Celsius) showing the presence of baby star surrounded by a hot core. The size of the hot core is unusually large, i.e. from 800 to 300 AUs. Usually, the size of hot cores around low-mass young stars is up to hundred AUs.

Among the other properties are the speed of the emanated gas i.e., about 17 miles per second (28 km/s) and the extent is 4,400 AU. Scientists calculated the age of the outflow as only 740 years based on these values.

All these properties are showing that the protostar in MM3 is very young but has a giant hot core.


ALMA discovers large “hot” cocoon around a small baby star – Astronomy (

Usman Zafar Paracha

Usman Zafar Paracha is a sort of entrepreneur. He is the author of "Color Atlas of Statistics", and the owner of an Android game "Faily Rocket."